diff --git a/chai.js b/chai.js
index 1392aed..b1c60d5 100644
--- a/chai.js
+++ b/chai.js
@@ -1,11 +1,11 @@
-!function (name, definition) {
-  if (typeof define == 'function' && typeof define.amd  == 'object') define(definition);
-  else this[name] = definition();
-}('chai', function () {
+!function (name, context, definition) {
+  if (typeof module !== 'undefined') module.exports = definition(name, context);
+  else if (typeof define === 'function' && typeof define.amd  === 'object') define(definition);
+  else context[name] = definition(name, context);
+}('chai', this, function (name, context) {
 
-// CommonJS require()
 
-function require(p){
+  function require(p) {
     var path = require.resolve(p)
       , mod = require.modules[path];
     if (!mod) throw new Error('failed to require "' + p + '"');
@@ -16,9 +16,9 @@ function require(p){
     return mod.exports;
   }
 
-require.modules = {};
+  require.modules = {};
 
-require.resolve = function (path){
+  require.resolve = function (path) {
     var orig = path
       , reg = path + '.js'
       , index = path + '/index.js';
@@ -27,11 +27,11 @@ require.resolve = function (path){
       || orig;
   };
 
-require.register = function (path, fn){
+  require.register = function (path, fn) {
     require.modules[path] = fn;
   };
 
-require.relative = function (parent) {
+  require.relative = function (parent) {
     return function(p){
       if ('.' != p[0]) return require(p);
 
@@ -49,3416 +49,3422 @@ require.relative = function (parent) {
     };
   };
 
-
-require.register("chai.js", function(module, exports, require){
-/*!
- * chai
- * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-var used = []
-  , exports = module.exports = {};
-
-/*!
- * Chai version
- */
-
-exports.version = '1.1.0';
-
-/*!
- * Primary `Assertion` prototype
- */
-
-exports.Assertion = require('./chai/assertion');
-
-/*!
- * Assertion Error
- */
-
-exports.AssertionError = require('./chai/browser/error');
-
-/*!
- * Utils for plugins (not exported)
- */
-
-var util = require('./chai/utils');
-
-/**
- * # .use(function)
- *
- * Provides a way to extend the internals of Chai
- *
- * @param {Function}
- * @returns {this} for chaining
- * @api public
- */
-
-exports.use = function (fn) {
-  if (!~used.indexOf(fn)) {
-    fn(this, util);
-    used.push(fn);
-  }
-
-  return this;
-};
-
-/*!
- * Core Assertions
- */
-
-var core = require('./chai/core/assertions');
-exports.use(core);
-
-/*!
- * Expect interface
- */
-
-var expect = require('./chai/interface/expect');
-exports.use(expect);
-
-/*!
- * Should interface
- */
-
-var should = require('./chai/interface/should');
-exports.use(should);
-
-/*!
- * Assert interface
- */
-
-var assert = require('./chai/interface/assert');
-exports.use(assert);
-
-}); // module: chai.js
-
-require.register("chai/assertion.js", function(module, exports, require){
-/*!
- * chai
- * http://chaijs.com
- * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-/*!
- * Module dependencies.
- */
-
-var AssertionError = require('./browser/error')
-  , util = require('./utils')
-  , flag = util.flag;
-
-/*!
- * Module export.
- */
-
-module.exports = Assertion;
+  require.alias = function (from, to) {
+    var fn = require.modules[from];
+    require.modules[to] = fn;
+  };
 
 
-/*!
- * Assertion Constructor
- *
- * Creates object for chaining.
- *
- * @api private
- */
+  require.register("chai.js", function(module, exports, require){
+    /*!
+     * chai
+     * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
 
-function Assertion (obj, msg, stack) {
-  flag(this, 'ssfi', stack || arguments.callee);
-  flag(this, 'object', obj);
-  flag(this, 'message', msg);
-}
+    var used = []
+      , exports = module.exports = {};
 
-/*!
-  * ### Assertion.includeStack
-  *
-  * User configurable property, influences whether stack trace
-  * is included in Assertion error message. Default of false
-  * suppresses stack trace in the error message
-  *
-  *     Assertion.includeStack = true;  // enable stack on error
-  *
-  * @api public
-  */
+    /*!
+     * Chai version
+     */
 
-Assertion.includeStack = false;
+    exports.version = '1.1.0';
 
-Assertion.addProperty = function (name, fn) {
-  util.addProperty(this.prototype, name, fn);
-};
+    /*!
+     * Primary `Assertion` prototype
+     */
 
-Assertion.addMethod = function (name, fn) {
-  util.addMethod(this.prototype, name, fn);
-};
+    exports.Assertion = require('./chai/assertion');
 
-Assertion.addChainableMethod = function (name, fn, chainingBehavior) {
-  util.addChainableMethod(this.prototype, name, fn, chainingBehavior);
-};
+    /*!
+     * Assertion Error
+     */
 
-Assertion.overwriteProperty = function (name, fn) {
-  util.overwriteProperty(this.prototype, name, fn);
-};
+    exports.AssertionError = require('./chai/browser/error');
 
-Assertion.overwriteMethod = function (name, fn) {
-  util.overwriteMethod(this.prototype, name, fn);
-};
+    /*!
+     * Utils for plugins (not exported)
+     */
 
-/*!
- * ### .assert(expression, message, negateMessage, expected, actual)
- *
- * Executes an expression and check expectations. Throws AssertionError for reporting if test doesn't pass.
- *
- * @name assert
- * @param {Philosophical} expression to be tested
- * @param {String} message to display if fails
- * @param {String} negatedMessage to display if negated expression fails
- * @param {Mixed} expected value (remember to check for negation)
- * @param {Mixed} actual (optional) will default to `this.obj`
- * @api private
- */
+    var util = require('./chai/utils');
 
-Assertion.prototype.assert = function (expr, msg, negateMsg, expected, _actual) {
-  var msg = util.getMessage(this, arguments)
-    , actual = util.getActual(this, arguments)
-    , ok = util.test(this, arguments);
+    /**
+     * # .use(function)
+     *
+     * Provides a way to extend the internals of Chai
+     *
+     * @param {Function}
+     * @returns {this} for chaining
+     * @api public
+     */
 
-  if (!ok) {
-    throw new AssertionError({
-        message: msg
-      , actual: actual
-      , expected: expected
-      , stackStartFunction: (Assertion.includeStack) ? this.assert : flag(this, 'ssfi')
-    });
-  }
-};
+    exports.use = function (fn) {
+      if (!~used.indexOf(fn)) {
+        fn(this, util);
+        used.push(fn);
+      }
 
-/*!
- * ### ._obj
- *
- * Quick reference to stored `actual` value for plugin developers.
- *
- * @api private
- */
-
-Object.defineProperty(Assertion.prototype, '_obj',
-  { get: function () {
-      return flag(this, 'object');
-    }
-  , set: function (val) {
-      flag(this, 'object', val);
-    }
-});
-
-}); // module: chai/assertion.js
-
-require.register("chai/browser/error.js", function(module, exports, require){
-/*!
- * chai
- * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-module.exports = AssertionError;
-
-function AssertionError (options) {
-  options = options || {};
-  this.message = options.message;
-  this.actual = options.actual;
-  this.expected = options.expected;
-  this.operator = options.operator;
-
-  if (options.stackStartFunction && Error.captureStackTrace) {
-    var stackStartFunction = options.stackStartFunction;
-    Error.captureStackTrace(this, stackStartFunction);
-  }
-}
-
-AssertionError.prototype = Object.create(Error.prototype);
-AssertionError.prototype.name = 'AssertionError';
-AssertionError.prototype.constructor = AssertionError;
-
-AssertionError.prototype.toString = function() {
-  return this.message;
-};
-
-}); // module: chai/browser/error.js
-
-require.register("chai/core/assertions.js", function(module, exports, require){
-/*!
- * chai
- * http://chaijs.com
- * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-module.exports = function (chai, _) {
-  var Assertion = chai.Assertion
-    , toString = Object.prototype.toString
-    , flag = _.flag;
-
-  /**
-   * ### Language Chains
-   *
-   * The following are provide as chainable getters to
-   * improve the readability of your assertions. They
-   * do not provide an testing capability unless they
-   * have been overwritten by a plugin.
-   *
-   * **Chains**
-   *
-   * - to
-   * - be
-   * - been
-   * - is
-   * - that
-   * - and
-   * - have
-   * - with
-   *
-   * @name language chains
-   * @api public
-   */
-
-  [ 'to', 'be', 'been'
-  , 'is', 'and', 'have'
-  , 'with', 'that' ].forEach(function (chain) {
-    Assertion.addProperty(chain, function () {
       return this;
-    });
-  });
+    };
 
-  /**
-   * ### .not
-   *
-   * Negates any of assertions following in the chain.
-   *
-   *     expect(foo).to.not.equal('bar');
-   *     expect(goodFn).to.not.throw(Error);
-   *     expect({ foo: 'baz' }).to.have.property('foo')
-   *       .and.not.equal('bar');
-   *
-   * @name not
-   * @api public
-   */
+    /*!
+     * Core Assertions
+     */
 
-  Assertion.addProperty('not', function () {
-    flag(this, 'negate', true);
-  });
+    var core = require('./chai/core/assertions');
+    exports.use(core);
 
-  /**
-   * ### .deep
-   *
-   * Sets the `deep` flag, later used by the `equal` and
-   * `property` assertions.
-   *
-   *     expect(foo).to.deep.equal({ bar: 'baz' });
-   *     expect({ foo: { bar: { baz: 'quux' } } })
-   *       .to.have.deep.property('foo.bar.baz', 'quux');
-   *
-   * @name deep
-   * @api public
-   */
+    /*!
+     * Expect interface
+     */
 
-  Assertion.addProperty('deep', function () {
-    flag(this, 'deep', true);
-  });
+    var expect = require('./chai/interface/expect');
+    exports.use(expect);
 
-  /**
-   * ### .a(type)
-   *
-   * The `a` and `an` assertions are aliases that can be
-   * used either as language chains or to assert a value's
-   * type (as revealed by `Object.prototype.toString`).
-   *
-   *     // typeof
-   *     expect('test').to.be.a('string');
-   *     expect({ foo: 'bar' }).to.be.an('object');
-   *     expect(null).to.be.a('null');
-   *     expect(undefined).to.be.an('undefined');
-   *
-   *     // language chain
-   *     expect(foo).to.be.an.instanceof(Foo);
-   *
-   * @name a
-   * @alias an
-   * @param {String} type
-   * @api public
-   */
+    /*!
+     * Should interface
+     */
 
-  function an(type) {
-    var obj = flag(this, 'object')
-      , klassStart = type.charAt(0).toUpperCase()
-      , klass = klassStart + type.slice(1)
-      , article = ~[ 'A', 'E', 'I', 'O', 'U' ].indexOf(klassStart) ? 'an ' : 'a ';
+    var should = require('./chai/interface/should');
+    exports.use(should);
 
-    this.assert(
-        '[object ' + klass + ']' === toString.call(obj)
-      , 'expected #{this} to be ' + article + type
-      , 'expected #{this} not to be ' + article + type
-    );
-  }
+    /*!
+     * Assert interface
+     */
 
-  Assertion.addChainableMethod('an', an);
-  Assertion.addChainableMethod('a', an);
+    var assert = require('./chai/interface/assert');
+    exports.use(assert);
 
-  /**
-   * ### .include(value)
-   *
-   * The `include` and `contain` assertions can be used as either property
-   * based language chains or as methods to assert the inclusion of an object
-   * in an array or a substring in a string. When used as language chains,
-   * they toggle the `contain` flag for the `keys` assertion.
-   *
-   *     expect([1,2,3]).to.include(2);
-   *     expect('foobar').to.contain('foo');
-   *     expect({ foo: 'bar', hello: 'universe' }).to.include.keys('foo');
-   *
-   * @name include
-   * @alias contain
-   * @param {Object|String|Number} obj
-   * @api public
-   */
+  }); // module: chai.js
 
-  function includeChainingBehavior () {
-    flag(this, 'contains', true);
-  }
+  require.register("chai/assertion.js", function(module, exports, require){
+    /*!
+     * chai
+     * http://chaijs.com
+     * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
 
-  function include (val) {
-    var obj = flag(this, 'object')
-    this.assert(
-        ~obj.indexOf(val)
-      , 'expected #{this} to include ' + _.inspect(val)
-      , 'expected #{this} to not include ' + _.inspect(val));
-  }
+    /*!
+     * Module dependencies.
+     */
 
-  Assertion.addChainableMethod('include', include, includeChainingBehavior);
-  Assertion.addChainableMethod('contain', include, includeChainingBehavior);
+    var AssertionError = require('./browser/error')
+      , util = require('./utils')
+      , flag = util.flag;
 
-  /**
-   * ### .ok
-   *
-   * Asserts that the target is truthy.
-   *
-   *     expect('everthing').to.be.ok;
-   *     expect(1).to.be.ok;
-   *     expect(false).to.not.be.ok;
-   *     expect(undefined).to.not.be.ok;
-   *     expect(null).to.not.be.ok;
-   *
-   * @name ok
-   * @api public
-   */
+    /*!
+     * Module export.
+     */
 
-  Assertion.addProperty('ok', function () {
-    this.assert(
-        flag(this, 'object')
-      , 'expected #{this} to be truthy'
-      , 'expected #{this} to be falsy');
-  });
-
-  /**
-   * ### .true
-   *
-   * Asserts that the target is `true`.
-   *
-   *     expect(true).to.be.true;
-   *     expect(1).to.not.be.true;
-   *
-   * @name true
-   * @api public
-   */
-
-  Assertion.addProperty('true', function () {
-    this.assert(
-        true === flag(this, 'object')
-      , 'expected #{this} to be true'
-      , 'expected #{this} to be false'
-      , this.negate ? false : true
-    );
-  });
-
-  /**
-   * ### .false
-   *
-   * Asserts that the target is `false`.
-   *
-   *     expect(false).to.be.false;
-   *     expect(0).to.not.be.false;
-   *
-   * @name false
-   * @api public
-   */
-
-  Assertion.addProperty('false', function () {
-    this.assert(
-        false === flag(this, 'object')
-      , 'expected #{this} to be false'
-      , 'expected #{this} to be true'
-      , this.negate ? true : false
-    );
-  });
-
-  /**
-   * ### .null
-   *
-   * Asserts that the target is `null`.
-   *
-   *     expect(null).to.be.null;
-   *     expect(undefined).not.to.be.null;
-   *
-   * @name null
-   * @api public
-   */
-
-  Assertion.addProperty('null', function () {
-    this.assert(
-        null === flag(this, 'object')
-      , 'expected #{this} to be null'
-      , 'expected #{this} not to be null'
-    );
-  });
-
-  /**
-   * ### .undefined
-   *
-   * Asserts that the target is `undefined`.
-   *
-   *      expect(undefined).to.be.undefined;
-   *      expect(null).to.not.be.undefined;
-   *
-   * @name undefined
-   * @api public
-   */
-
-  Assertion.addProperty('undefined', function () {
-    this.assert(
-        undefined === flag(this, 'object')
-      , 'expected #{this} to be undefined'
-      , 'expected #{this} not to be undefined'
-    );
-  });
-
-  /**
-   * ### .exist
-   *
-   * Asserts that the target is neither `null` nor `undefined`.
-   *
-   *     var foo = 'hi'
-   *       , bar = null
-   *       , baz;
-   *
-   *     expect(foo).to.exist;
-   *     expect(bar).to.not.exist;
-   *     expect(baz).to.not.exist;
-   *
-   * @name exist
-   * @api public
-   */
-
-  Assertion.addProperty('exist', function () {
-    this.assert(
-        null != flag(this, 'object')
-      , 'expected #{this} to exist'
-      , 'expected #{this} to not exist'
-    );
-  });
+    module.exports = Assertion;
 
 
-  /**
-   * ### .empty
-   *
-   * Asserts that the target's length is `0`. For arrays, it checks
-   * the `length` property. For objects, it gets the count of
-   * enumerable keys.
-   *
-   *     expect([]).to.be.empty;
-   *     expect('').to.be.empty;
-   *     expect({}).to.be.empty;
-   *
-   * @name empty
-   * @api public
-   */
+    /*!
+     * Assertion Constructor
+     *
+     * Creates object for chaining.
+     *
+     * @api private
+     */
 
-  Assertion.addProperty('empty', function () {
-    var obj = flag(this, 'object')
-      , expected = obj;
-
-    if (Array.isArray(obj) || 'string' === typeof object) {
-      expected = obj.length;
-    } else if (typeof obj === 'object') {
-      expected = Object.keys(obj).length;
+    function Assertion (obj, msg, stack) {
+      flag(this, 'ssfi', stack || arguments.callee);
+      flag(this, 'object', obj);
+      flag(this, 'message', msg);
     }
 
-    this.assert(
-        !expected
-      , 'expected #{this} to be empty'
-      , 'expected #{this} not to be empty'
-    );
-  });
+    /*!
+      * ### Assertion.includeStack
+      *
+      * User configurable property, influences whether stack trace
+      * is included in Assertion error message. Default of false
+      * suppresses stack trace in the error message
+      *
+      *     Assertion.includeStack = true;  // enable stack on error
+      *
+      * @api public
+      */
 
-  /**
-   * ### .arguments
-   *
-   * Asserts that the target is an arguments object.
-   *
-   *     function test () {
-   *       expect(arguments).to.be.arguments;
-   *     }
-   *
-   * @name arguments
-   * @alias Arguments
-   * @api public
-   */
+    Assertion.includeStack = false;
 
-  function checkArguments () {
-    var obj = flag(this, 'object')
-      , type = Object.prototype.toString.call(obj);
-    this.assert(
-        '[object Arguments]' === type
-      , 'expected #{this} to be arguments but got ' + type
-      , 'expected #{this} to not be arguments'
-    );
-  }
+    Assertion.addProperty = function (name, fn) {
+      util.addProperty(this.prototype, name, fn);
+    };
 
-  Assertion.addProperty('arguments', checkArguments);
-  Assertion.addProperty('Arguments', checkArguments);
+    Assertion.addMethod = function (name, fn) {
+      util.addMethod(this.prototype, name, fn);
+    };
 
-  /**
-   * ### .equal(value)
-   *
-   * Asserts that the target is strictly equal (`===`) to `value`.
-   * Alternately, if the `deep` flag is set, asserts that
-   * the target is deeply equal to `value`.
-   *
-   *     expect('hello').to.equal('hello');
-   *     expect(42).to.equal(42);
-   *     expect(1).to.not.equal(true);
-   *     expect({ foo: 'bar' }).to.not.equal({ foo: 'bar' });
-   *     expect({ foo: 'bar' }).to.deep.equal({ foo: 'bar' });
-   *
-   * @name equal
-   * @alias eq
-   * @alias deep.equal
-   * @param {Mixed} value
-   * @api public
-   */
+    Assertion.addChainableMethod = function (name, fn, chainingBehavior) {
+      util.addChainableMethod(this.prototype, name, fn, chainingBehavior);
+    };
 
-  function assertEqual (val) {
-    var obj = flag(this, 'object');
-    if (flag(this, 'deep')) {
-      return this.eql(val);
-    } else {
-      this.assert(
-          val === obj
-        , 'expected #{this} to equal #{exp}'
-        , 'expected #{this} to not equal #{exp}'
-        , val
-      );
-    }
-  }
+    Assertion.overwriteProperty = function (name, fn) {
+      util.overwriteProperty(this.prototype, name, fn);
+    };
 
-  Assertion.addMethod('equal', assertEqual);
-  Assertion.addMethod('eq', assertEqual);
+    Assertion.overwriteMethod = function (name, fn) {
+      util.overwriteMethod(this.prototype, name, fn);
+    };
 
-  /**
-   * ### .eql(value)
-   *
-   * Asserts that the target is deeply equal to `value`.
-   *
-   *     expect({ foo: 'bar' }).to.eql({ foo: 'bar' });
-   *     expect([ 1, 2, 3 ]).to.eql([ 1, 2, 3 ]);
-   *
-   * @name eql
-   * @param {Mixed} value
-   * @api public
-   */
+    /*!
+     * ### .assert(expression, message, negateMessage, expected, actual)
+     *
+     * Executes an expression and check expectations. Throws AssertionError for reporting if test doesn't pass.
+     *
+     * @name assert
+     * @param {Philosophical} expression to be tested
+     * @param {String} message to display if fails
+     * @param {String} negatedMessage to display if negated expression fails
+     * @param {Mixed} expected value (remember to check for negation)
+     * @param {Mixed} actual (optional) will default to `this.obj`
+     * @api private
+     */
 
-  Assertion.addMethod('eql', function (obj) {
-    this.assert(
-        _.eql(obj, flag(this, 'object'))
-      , 'expected #{this} to deeply equal #{exp}'
-      , 'expected #{this} to not deeply equal #{exp}'
-      , obj
-    );
-  });
+    Assertion.prototype.assert = function (expr, msg, negateMsg, expected, _actual) {
+      var msg = util.getMessage(this, arguments)
+        , actual = util.getActual(this, arguments)
+        , ok = util.test(this, arguments);
 
-  /**
-   * ### .above(value)
-   *
-   * Asserts that the target is greater than `value`.
-   *
-   *     expect(10).to.be.above(5);
-   *
-   * Can also be used in conjunction with `length` to
-   * assert a minimum length. The benefit being a
-   * more informative error message than if the length
-   * was supplied directly.
-   *
-   *     expect('foo').to.have.length.above(2);
-   *     expect([ 1, 2, 3 ]).to.have.length.above(2);
-   *
-   * @name above
-   * @alias gt
-   * @alias greaterThan
-   * @param {Number} value
-   * @api public
-   */
-
-  function assertAbove (n) {
-    var obj = flag(this, 'object');
-    if (flag(this, 'doLength')) {
-      new Assertion(obj).to.have.property('length');
-      var len = obj.length;
-      this.assert(
-          len > n
-        , 'expected #{this} to have a length above #{exp} but got #{act}'
-        , 'expected #{this} to not have a length above #{exp}'
-        , n
-        , len
-      );
-    } else {
-      this.assert(
-          obj > n
-        , 'expected #{this} to be above ' + n
-        , 'expected #{this} to be below ' + n
-      );
-    }
-  }
-
-  Assertion.addMethod('above', assertAbove);
-  Assertion.addMethod('gt', assertAbove);
-  Assertion.addMethod('greaterThan', assertAbove);
-
-  /**
-   * ### .below(value)
-   *
-   * Asserts that the target is less than `value`.
-   *
-   *     expect(5).to.be.below(10);
-   *
-   * Can also be used in conjunction with `length` to
-   * assert a maximum length. The benefit being a
-   * more informative error message than if the length
-   * was supplied directly.
-   *
-   *     expect('foo').to.have.length.below(4);
-   *     expect([ 1, 2, 3 ]).to.have.length.below(4);
-   *
-   * @name below
-   * @alias lt
-   * @alias lessThan
-   * @param {Number} value
-   * @api public
-   */
-
-  function assertBelow (n) {
-    var obj = flag(this, 'object');
-    if (flag(this, 'doLength')) {
-      new Assertion(obj).to.have.property('length');
-      var len = obj.length;
-      this.assert(
-          len < n
-        , 'expected #{this} to have a length below #{exp} but got #{act}'
-        , 'expected #{this} to not have a length below #{exp}'
-        , n
-        , len
-      );
-    } else {
-      this.assert(
-          obj < n
-        , 'expected #{this} to be below ' + n
-        , 'expected #{this} to be above ' + n
-      );
-    }
-  }
-
-  Assertion.addMethod('below', assertBelow);
-  Assertion.addMethod('lt', assertBelow);
-  Assertion.addMethod('lessThan', assertBelow);
-
-  /**
-   * ### .within(start, finish)
-   *
-   * Asserts that the target is within a range.
-   *
-   *     expect(7).to.be.within(5,10);
-   *
-   * Can also be used in conjunction with `length` to
-   * assert a length range. The benefit being a
-   * more informative error message than if the length
-   * was supplied directly.
-   *
-   *     expect('foo').to.have.length.within(2,4);
-   *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);
-   *
-   * @name within
-   * @param {Number} start lowerbound inclusive
-   * @param {Number} finish upperbound inclusive
-   * @api public
-   */
-
-  Assertion.addMethod('within', function (start, finish) {
-    var obj = flag(this, 'object')
-      , range = start + '..' + finish;
-    if (flag(this, 'doLength')) {
-      new Assertion(obj).to.have.property('length');
-      var len = obj.length;
-      this.assert(
-          len >= start && len <= finish
-        , 'expected #{this} to have a length within ' + range
-        , 'expected #{this} to not have a length within ' + range
-      );
-    } else {
-      this.assert(
-          obj >= start && obj <= finish
-        , 'expected #{this} to be within ' + range
-        , 'expected #{this} to not be within ' + range
-      );
-    }
-  });
-
-  /**
-   * ### .instanceof(constructor)
-   *
-   * Asserts that the target is an instance of `constructor`.
-   *
-   *     var Tea = function (name) { this.name = name; }
-   *       , Chai = new Tea('chai');
-   *
-   *     expect(Chai).to.be.an.instanceof(Tea);
-   *     expect([ 1, 2, 3 ]).to.be.instanceof(Array);
-   *
-   * @name instanceof
-   * @param {Constructor} constructor
-   * @alias instanceOf
-   * @api public
-   */
-
-  function assertInstanceOf (constructor) {
-    var name = _.getName(constructor);
-    this.assert(
-        flag(this, 'object') instanceof constructor
-      , 'expected #{this} to be an instance of ' + name
-      , 'expected #{this} to not be an instance of ' + name
-    );
-  };
-
-  Assertion.addMethod('instanceof', assertInstanceOf);
-  Assertion.addMethod('instanceOf', assertInstanceOf);
-
-  /**
-   * ### .property(name, [value])
-   *
-   * Asserts that the target has a property `name`, optionally asserting that
-   * the value of that property is strictly equal to  `value`.
-   * If the `deep` flag is set, you can use dot- and bracket-notation for deep
-   * references into objects and arrays.
-   *
-   *     // simple referencing
-   *     var obj = { foo: 'bar' };
-   *     expect(obj).to.have.property('foo');
-   *     expect(obj).to.have.property('foo', 'bar');
-   *
-   *     // deep referencing
-   *     var deepObj = {
-   *         green: { tea: 'matcha' }
-   *       , teas: [ 'chai', 'matcha', { tea: 'konacha' } ]
-   *     };
-
-   *     expect(deepObj).to.have.deep.property('green.tea', 'matcha');
-   *     expect(deepObj).to.have.deep.property('teas[1]', 'matcha');
-   *     expect(deepObj).to.have.deep.property('teas[2].tea', 'konacha');
-   *
-   * You can also use an array as the starting point of a `deep.property`
-   * assertion, or traverse nested arrays.
-   *
-   *     var arr = [
-   *         [ 'chai', 'matcha', 'konacha' ]
-   *       , [ { tea: 'chai' }
-   *         , { tea: 'matcha' }
-   *         , { tea: 'konacha' } ]
-   *     ];
-   *
-   *     expect(arr).to.have.deep.property('[0][1]', 'matcha');
-   *     expect(arr).to.have.deep.property('[1][2].tea', 'konacha');
-   *
-   * Furthermore, `property` changes the subject of the assertion
-   * to be the value of that property from the original object. This
-   * permits for further chainable assertions on that property.
-   *
-   *     expect(obj).to.have.property('foo')
-   *       .that.is.a('string');
-   *     expect(deepObj).to.have.property('green')
-   *       .that.is.an('object')
-   *       .that.deep.equals({ tea: 'matcha' });
-   *     expect(deepObj).to.have.property('teas')
-   *       .that.is.an('array')
-   *       .with.deep.property('[2]')
-   *         .that.deep.equals({ tea: 'konacha' });
-   *
-   * @name property
-   * @alias deep.property
-   * @param {String} name
-   * @param {Mixed} value (optional)
-   * @returns value of property for chaining
-   * @api public
-   */
-
-  Assertion.addMethod('property', function (name, val) {
-    var obj = flag(this, 'object')
-      , value = flag(this, 'deep') ? _.getPathValue(name, obj) : obj[name]
-      , descriptor = flag(this, 'deep') ? 'deep property ' : 'property '
-      , negate = flag(this, 'negate');
-
-    if (negate && undefined !== val) {
-      if (undefined === value) {
-        throw new Error(_.inspect(obj) + ' has no ' + descriptor + _.inspect(name));
+      if (!ok) {
+        throw new AssertionError({
+            message: msg
+          , actual: actual
+          , expected: expected
+          , stackStartFunction: (Assertion.includeStack) ? this.assert : flag(this, 'ssfi')
+        });
       }
-    } else {
-      this.assert(
-          undefined !== value
-        , 'expected #{this} to have a ' + descriptor + _.inspect(name)
-        , 'expected #{this} to not have ' + descriptor + _.inspect(name));
-    }
-
-    if (undefined !== val) {
-      this.assert(
-          val === value
-        , 'expected #{this} to have a ' + descriptor + _.inspect(name) + ' of #{exp}, but got #{act}'
-        , 'expected #{this} to not have a ' + descriptor + _.inspect(name) + ' of #{act}'
-        , val
-        , value
-      );
-    }
-
-    flag(this, 'object', value);
-  });
-
-
-  /**
-   * ### .ownProperty(name)
-   *
-   * Asserts that the target has an own property `name`.
-   *
-   *     expect('test').to.have.ownProperty('length');
-   *
-   * @name ownProperty
-   * @alias haveOwnProperty
-   * @param {String} name
-   * @api public
-   */
-
-  function assertOwnProperty (name) {
-    var obj = flag(this, 'object');
-    this.assert(
-        obj.hasOwnProperty(name)
-      , 'expected #{this} to have own property ' + _.inspect(name)
-      , 'expected #{this} to not have own property ' + _.inspect(name)
-    );
-  }
-
-  Assertion.addMethod('ownProperty', assertOwnProperty);
-  Assertion.addMethod('haveOwnProperty', assertOwnProperty);
-
-  /**
-   * ### .length(value)
-   *
-   * Asserts that the target's `length` property has
-   * the expected value.
-   *
-   *     expect([ 1, 2, 3]).to.have.length(3);
-   *     expect('foobar').to.have.length(6);
-   *
-   * Can also be used as a chain precursor to a value
-   * comparison for the length property.
-   *
-   *     expect('foo').to.have.length.above(2);
-   *     expect([ 1, 2, 3 ]).to.have.length.above(2);
-   *     expect('foo').to.have.length.below(4);
-   *     expect([ 1, 2, 3 ]).to.have.length.below(4);
-   *     expect('foo').to.have.length.within(2,4);
-   *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);
-   *
-   * @name length
-   * @alias lengthOf
-   * @param {Number} length
-   * @api public
-   */
-
-  function assertLengthChain () {
-    flag(this, 'doLength', true);
-  }
-
-  function assertLength (n) {
-    var obj = flag(this, 'object');
-    new Assertion(obj).to.have.property('length');
-    var len = obj.length;
-
-    this.assert(
-        len == n
-      , 'expected #{this} to have a length of #{exp} but got #{act}'
-      , 'expected #{this} to not have a length of #{act}'
-      , n
-      , len
-    );
-  }
-
-  Assertion.addChainableMethod('length', assertLength, assertLengthChain);
-  Assertion.addMethod('lengthOf', assertLength, assertLengthChain);
-
-  /**
-   * ### .match(regexp)
-   *
-   * Asserts that the target matches a regular expression.
-   *
-   *     expect('foobar').to.match(/^foo/);
-   *
-   * @name match
-   * @param {RegExp} RegularExpression
-   * @api public
-   */
-
-  Assertion.addMethod('match', function (re) {
-    var obj = flag(this, 'object');
-    this.assert(
-        re.exec(obj)
-      , 'expected #{this} to match ' + re
-      , 'expected #{this} not to match ' + re
-    );
-  });
-
-  /**
-   * ### .string(string)
-   *
-   * Asserts that the string target contains another string.
-   *
-   *     expect('foobar').to.have.string('bar');
-   *
-   * @name string
-   * @param {String} string
-   * @api public
-   */
-
-  Assertion.addMethod('string', function (str) {
-    var obj = flag(this, 'object');
-    new Assertion(obj).is.a('string');
-
-    this.assert(
-        ~obj.indexOf(str)
-      , 'expected #{this} to contain ' + _.inspect(str)
-      , 'expected #{this} to not contain ' + _.inspect(str)
-    );
-  });
-
-
-  /**
-   * ### .keys(key1, [key2], [...])
-   *
-   * Asserts that the target has exactly the given keys, or
-   * asserts the inclusion of some keys when using the
-   * `include` or `contain` modifiers.
-   *
-   *     expect({ foo: 1, bar: 2 }).to.have.keys(['foo', 'bar']);
-   *     expect({ foo: 1, bar: 2, baz: 3 }).to.contain.keys('foo', 'bar');
-   *
-   * @name keys
-   * @alias key
-   * @param {String...|Array} keys
-   * @api public
-   */
-
-  function assertKeys (keys) {
-    var obj = flag(this, 'object')
-      , str
-      , ok = true;
-
-    keys = keys instanceof Array
-      ? keys
-      : Array.prototype.slice.call(arguments);
-
-    if (!keys.length) throw new Error('keys required');
-
-    var actual = Object.keys(obj)
-      , len = keys.length;
-
-    // Inclusion
-    ok = keys.every(function(key){
-      return ~actual.indexOf(key);
-    });
-
-    // Strict
-    if (!flag(this, 'negate') && !flag(this, 'contains')) {
-      ok = ok && keys.length == actual.length;
-    }
-
-    // Key string
-    if (len > 1) {
-      keys = keys.map(function(key){
-        return _.inspect(key);
-      });
-      var last = keys.pop();
-      str = keys.join(', ') + ', and ' + last;
-    } else {
-      str = _.inspect(keys[0]);
-    }
-
-    // Form
-    str = (len > 1 ? 'keys ' : 'key ') + str;
-
-    // Have / include
-    str = (flag(this, 'contains') ? 'contain ' : 'have ') + str;
-
-    // Assertion
-    this.assert(
-        ok
-      , 'expected #{this} to ' + str
-      , 'expected #{this} to not ' + str
-    );
-  }
-
-  Assertion.addMethod('keys', assertKeys);
-  Assertion.addMethod('key', assertKeys);
-
-  /**
-   * ### .throw(constructor)
-   *
-   * Asserts that the function target will throw a specific error, or specific type of error
-   * (as determined using `instanceof`), optionally with a RegExp or string inclusion test
-   * for the error's message.
-   *
-   *     var err = new ReferenceError('This is a bad function.');
-   *     var fn = function () { throw err; }
-   *     expect(fn).to.throw(ReferenceError);
-   *     expect(fn).to.throw(Error);
-   *     expect(fn).to.throw(/bad function/);
-   *     expect(fn).to.not.throw('good function');
-   *     expect(fn).to.throw(ReferenceError, /bad function/);
-   *     expect(fn).to.throw(err);
-   *     expect(fn).to.not.throw(new RangeError('Out of range.'));
-   *
-   * Please note that when a throw expectation is negated, it will check each
-   * parameter independently, starting with error constructor type. The appropriate way
-   * to check for the existence of a type of error but for a message that does not match
-   * is to use `and`.
-   *
-   *     expect(fn).to.throw(ReferenceError)
-   *        .and.not.throw(/good function/);
-   *
-   * @name throw
-   * @alias throws
-   * @alias Throw
-   * @param {ErrorConstructor} constructor
-   * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
-   * @api public
-   */
-
-  function assertThrows (constructor, msg) {
-    var obj = flag(this, 'object');
-    new Assertion(obj).is.a('function');
-
-    var thrown = false
-      , desiredError = null
-      , name = null;
-
-    if (arguments.length === 0) {
-      msg = null;
-      constructor = null;
-    } else if (constructor && (constructor instanceof RegExp || 'string' === typeof constructor)) {
-      msg = constructor;
-      constructor = null;
-    } else if (constructor && constructor instanceof Error) {
-      desiredError = constructor;
-      constructor = null;
-      msg = null;
-    } else if (typeof constructor === 'function') {
-      name = (new constructor()).name;
-    } else {
-      constructor = null;
-    }
-
-    try {
-      obj();
-    } catch (err) {
-      // first, check desired error
-      if (desiredError) {
-        this.assert(
-            err === desiredError
-          , 'expected #{this} to throw ' + _.inspect(desiredError) + ' but ' + _.inspect(err) + ' was thrown'
-          , 'expected #{this} to not throw ' + _.inspect(desiredError)
-        );
-        return this;
-      }
-      // next, check constructor
-      if (constructor) {
-        this.assert(
-            err instanceof constructor
-          , 'expected #{this} to throw ' + name + ' but a ' + err.name + ' was thrown'
-          , 'expected #{this} to not throw ' + name );
-        if (!msg) return this;
-      }
-      // next, check message
-      if (err.message && msg && msg instanceof RegExp) {
-        this.assert(
-            msg.exec(err.message)
-          , 'expected #{this} to throw error matching ' + msg + ' but got ' + _.inspect(err.message)
-          , 'expected #{this} to throw error not matching ' + msg
-        );
-        return this;
-      } else if (err.message && msg && 'string' === typeof msg) {
-        this.assert(
-            ~err.message.indexOf(msg)
-          , 'expected #{this} to throw error including #{exp} but got #{act}'
-          , 'expected #{this} to throw error not including #{act}'
-          , msg
-          , err.message
-        );
-        return this;
-      } else {
-        thrown = true;
-      }
-    }
-
-    var expectedThrown = name ? name : desiredError ? _.inspect(desiredError) : 'an error';
-
-    this.assert(
-        thrown === true
-      , 'expected #{this} to throw ' + expectedThrown
-      , 'expected #{this} to not throw ' + expectedThrown
-    );
-  };
-
-  Assertion.addMethod('throw', assertThrows);
-  Assertion.addMethod('throws', assertThrows);
-  Assertion.addMethod('Throw', assertThrows);
-
-  /**
-   * ### .respondTo(method)
-   *
-   * Asserts that the object or class target will respond to a method.
-   *
-   *     Klass.prototype.bar = function(){};
-   *     expect(Klass).to.respondTo('bar');
-   *     expect(obj).to.respondTo('bar');
-   *
-   * To check if a constructor will respond to a static function,
-   * set the `itself` flag.
-   *
-   *    Klass.baz = function(){};
-   *    expect(Klass).itself.to.respondTo('baz');
-   *
-   * @name respondTo
-   * @param {String} method
-   * @api public
-   */
-
-  Assertion.addMethod('respondTo', function (method) {
-    var obj = flag(this, 'object')
-      , itself = flag(this, 'itself')
-      , context = ('function' === typeof obj && !itself)
-        ? obj.prototype[method]
-        : obj[method];
-
-    this.assert(
-        'function' === typeof context
-      , 'expected #{this} to respond to ' + _.inspect(method)
-      , 'expected #{this} to not respond to ' + _.inspect(method)
-    );
-  });
-
-  /**
-   * ### .itself
-   *
-   * Sets the `itself` flag, later used by the `respondTo` assertion.
-   *
-   *    function Foo() {}
-   *    Foo.bar = function() {}
-   *    Foo.prototype.baz = function() {}
-   *
-   *    expect(Foo).itself.to.respondTo('bar');
-   *    expect(Foo).itself.not.to.respondTo('baz');
-   *
-   * @name itself
-   * @api public
-   */
-
-  Assertion.addProperty('itself', function () {
-    flag(this, 'itself', true);
-  });
-
-  /**
-   * ### .satisfy(method)
-   *
-   * Asserts that the target passes a given truth test.
-   *
-   *     expect(1).to.satisfy(function(num) { return num > 0; });
-   *
-   * @name satisfy
-   * @param {Function} matcher
-   * @api public
-   */
-
-  Assertion.addMethod('satisfy', function (matcher) {
-    var obj = flag(this, 'object');
-    this.assert(
-        matcher(obj)
-      , 'expected #{this} to satisfy ' + _.inspect(matcher)
-      , 'expected #{this} to not satisfy' + _.inspect(matcher)
-      , this.negate ? false : true
-      , matcher(obj)
-    );
-  });
-
-  /**
-   * ### .closeTo(expected, delta)
-   *
-   * Asserts that the target is equal `expected`, to within a +/- `delta` range.
-   *
-   *     expect(1.5).to.be.closeTo(1, 0.5);
-   *
-   * @name closeTo
-   * @param {Number} expected
-   * @param {Number} delta
-   * @api public
-   */
-
-  Assertion.addMethod('closeTo', function (expected, delta) {
-    var obj = flag(this, 'object');
-    this.assert(
-        Math.abs(obj - expected) <= delta
-      , 'expected #{this} to be close to ' + expected + ' +/- ' + delta
-      , 'expected #{this} not to be close to ' + expected + ' +/- ' + delta
-    );
-  });
-
-};
-
-}); // module: chai/core/assertions.js
-
-require.register("chai/interface/assert.js", function(module, exports, require){
-/*!
- * chai
- * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-
-module.exports = function (chai, util) {
-
-  /*!
-   * Chai dependencies.
-   */
-
-  var Assertion = chai.Assertion
-    , flag = util.flag;
-
-  /*!
-   * Module export.
-   */
-
-  /**
-   * ### assert(expression, message)
-   *
-   * Write your own test expressions.
-   *
-   *     assert('foo' !== 'bar', 'foo is not bar');
-   *     assert(Array.isArray([]), 'empty arrays are arrays');
-   *
-   * @param {Mixed} expression to test for truthiness
-   * @param {String} message to display on error
-   * @name assert
-   * @api public
-   */
-
-  var assert = chai.assert = function (express, errmsg) {
-    var test = new Assertion(null);
-    test.assert(
-        express
-      , errmsg
-      , '[ negation message unavailable ]'
-    );
-  };
-
-  /**
-   * ### .fail(actual, expected, [message], [operator])
-   *
-   * Throw a failure. Node.js `assert` module-compatible.
-   *
-   * @name fail
-   * @param {Mixed} actual
-   * @param {Mixed} expected
-   * @param {String} message
-   * @param {String} operator
-   * @api public
-   */
-
-  assert.fail = function (actual, expected, message, operator) {
-    throw new chai.AssertionError({
-        actual: actual
-      , expected: expected
-      , message: message
-      , operator: operator
-      , stackStartFunction: assert.fail
-    });
-  };
-
-  /**
-   * ### .ok(object, [message])
-   *
-   * Asserts that `object` is truthy.
-   *
-   *     assert.ok('everything', 'everything is ok');
-   *     assert.ok(false, 'this will fail');
-   *
-   * @name ok
-   * @param {Mixed} object to test
-   * @param {String} message
-   * @api public
-   */
-
-  assert.ok = function (val, msg) {
-    new Assertion(val, msg).is.ok;
-  };
-
-  /**
-   * ### .equal(actual, expected, [message])
-   *
-   * Asserts non-strict equality (`==`) of `actual` and `expected`.
-   *
-   *     assert.equal(3, '3', '== coerces values to strings');
-   *
-   * @name equal
-   * @param {Mixed} actual
-   * @param {Mixed} expected
-   * @param {String} message
-   * @api public
-   */
-
-  assert.equal = function (act, exp, msg) {
-    var test = new Assertion(act, msg);
-
-    test.assert(
-        exp == flag(test, 'object')
-      , 'expected #{this} to equal #{exp}'
-      , 'expected #{this} to not equal #{act}'
-      , exp
-      , act
-    );
-  };
-
-  /**
-   * ### .notEqual(actual, expected, [message])
-   *
-   * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
-   *
-   *     assert.notEqual(3, 4, 'these numbers are not equal');
-   *
-   * @name notEqual
-   * @param {Mixed} actual
-   * @param {Mixed} expected
-   * @param {String} message
-   * @api public
-   */
-
-  assert.notEqual = function (act, exp, msg) {
-    var test = new Assertion(act, msg);
-
-    test.assert(
-        exp != flag(test, 'object')
-      , 'expected #{this} to not equal #{exp}'
-      , 'expected #{this} to equal #{act}'
-      , exp
-      , act
-    );
-  };
-
-  /**
-   * ### .strictEqual(actual, expected, [message])
-   *
-   * Asserts strict equality (`===`) of `actual` and `expected`.
-   *
-   *     assert.strictEqual(true, true, 'these booleans are strictly equal');
-   *
-   * @name strictEqual
-   * @param {Mixed} actual
-   * @param {Mixed} expected
-   * @param {String} message
-   * @api public
-   */
-
-  assert.strictEqual = function (act, exp, msg) {
-    new Assertion(act, msg).to.equal(exp);
-  };
-
-  /**
-   * ### .notStrictEqual(actual, expected, [message])
-   *
-   * Asserts strict inequality (`!==`) of `actual` and `expected`.
-   *
-   *     assert.notStrictEqual(3, '3', 'no coercion for strict equality');
-   *
-   * @name notStrictEqual
-   * @param {Mixed} actual
-   * @param {Mixed} expected
-   * @param {String} message
-   * @api public
-   */
-
-  assert.notStrictEqual = function (act, exp, msg) {
-    new Assertion(act, msg).to.not.equal(exp);
-  };
-
-  /**
-   * ### .deepEqual(actual, expected, [message])
-   *
-   * Asserts that `actual` is deeply equal to `expected`.
-   *
-   *     assert.deepEqual({ tea: 'green' }, { tea: 'green' });
-   *
-   * @name deepEqual
-   * @param {Mixed} actual
-   * @param {Mixed} expected
-   * @param {String} message
-   * @api public
-   */
-
-  assert.deepEqual = function (act, exp, msg) {
-    new Assertion(act, msg).to.eql(exp);
-  };
-
-  /**
-   * ### .notDeepEqual(actual, expected, [message])
-   *
-   * Assert that `actual` is not deeply equal to `expected`.
-   *
-   *     assert.notDeepEqual({ tea: 'green' }, { tea: 'jasmine' });
-   *
-   * @name notDeepEqual
-   * @param {Mixed} actual
-   * @param {Mixed} expected
-   * @param {String} message
-   * @api public
-   */
-
-  assert.notDeepEqual = function (act, exp, msg) {
-    new Assertion(act, msg).to.not.eql(exp);
-  };
-
-  /**
-   * ### .isTrue(value, [message])
-   *
-   * Asserts that `value` is true.
-   *
-   *     var teaServed = true;
-   *     assert.isTrue(teaServed, 'the tea has been served');
-   *
-   * @name isTrue
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isTrue = function (val, msg) {
-    new Assertion(val, msg).is['true'];
-  };
-
-  /**
-   * ### .isFalse(value, [message])
-   *
-   * Asserts that `value` is false.
-   *
-   *     var teaServed = false;
-   *     assert.isFalse(teaServed, 'no tea yet? hmm...');
-   *
-   * @name isFalse
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isFalse = function (val, msg) {
-    new Assertion(val, msg).is['false'];
-  };
-
-  /**
-   * ### .isNull(value, [message])
-   *
-   * Asserts that `value` is null.
-   *
-   *     assert.isNull(err, 'there was no error');
-   *
-   * @name isNull
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isNull = function (val, msg) {
-    new Assertion(val, msg).to.equal(null);
-  };
-
-  /**
-   * ### .isNotNull(value, [message])
-   *
-   * Asserts that `value` is not null.
-   *
-   *     var tea = 'tasty chai';
-   *     assert.isNotNull(tea, 'great, time for tea!');
-   *
-   * @name isNotNull
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isNotNull = function (val, msg) {
-    new Assertion(val, msg).to.not.equal(null);
-  };
-
-  /**
-   * ### .isUndefined(value, [message])
-   *
-   * Asserts that `value` is `undefined`.
-   *
-   *     var tea;
-   *     assert.isUndefined(tea, 'no tea defined');
-   *
-   * @name isUndefined
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isUndefined = function (val, msg) {
-    new Assertion(val, msg).to.equal(undefined);
-  };
-
-  /**
-   * ### .isDefined(value, [message])
-   *
-   * Asserts that `value` is not `undefined`.
-   *
-   *     var tea = 'cup of chai';
-   *     assert.isDefined(tea, 'tea has been defined');
-   *
-   * @name isUndefined
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isDefined = function (val, msg) {
-    new Assertion(val, msg).to.not.equal(undefined);
-  };
-
-  /**
-   * ### .isFunction(value, [message])
-   *
-   * Asserts that `value` is a function.
-   *
-   *     function serveTea() { return 'cup of tea'; };
-   *     assert.isFunction(serveTea, 'great, we can have tea now');
-   *
-   * @name isFunction
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isFunction = function (val, msg) {
-    new Assertion(val, msg).to.be.a('function');
-  };
-
-  /**
-   * ### .isNotFunction(value, [message])
-   *
-   * Asserts that `value` is _not_ a function.
-   *
-   *     var serveTea = [ 'heat', 'pour', 'sip' ];
-   *     assert.isNotFunction(serveTea, 'great, we have listed the steps');
-   *
-   * @name isNotFunction
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isNotFunction = function (val, msg) {
-    new Assertion(val, msg).to.not.be.a('function');
-  };
-
-  /**
-   * ### .isObject(value, [message])
-   *
-   * Asserts that `value` is an object (as revealed by
-   * `Object.prototype.toString`).
-   *
-   *     var selection = { name: 'Chai', serve: 'with spices' };
-   *     assert.isObject(selection, 'tea selection is an object');
-   *
-   * @name isObject
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isObject = function (val, msg) {
-    new Assertion(val, msg).to.be.a('object');
-  };
-
-  /**
-   * ### .isNotObject(value, [message])
-   *
-   * Asserts that `value` is _not_ an object.
-   *
-   *     var selection = 'chai'
-   *     assert.isObject(selection, 'tea selection is not an object');
-   *     assert.isObject(null, 'null is not an object');
-   *
-   * @name isNotObject
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isNotObject = function (val, msg) {
-    new Assertion(val, msg).to.not.be.a('object');
-  };
-
-  /**
-   * ### .isArray(value, [message])
-   *
-   * Asserts that `value` is an array.
-   *
-   *     var menu = [ 'green', 'chai', 'oolong' ];
-   *     assert.isArray(menu, 'what kind of tea do we want?');
-   *
-   * @name isArray
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isArray = function (val, msg) {
-    new Assertion(val, msg).to.be.an('array');
-  };
-
-  /**
-   * ### .isNotArray(value, [message])
-   *
-   * Asserts that `value` is _not_ an array.
-   *
-   *     var menu = 'green|chai|oolong';
-   *     assert.isNotArray(menu, 'what kind of tea do we want?');
-   *
-   * @name isNotArray
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isNotArray = function (val, msg) {
-    new Assertion(val, msg).to.not.be.an('array');
-  };
-
-  /**
-   * ### .isString(value, [message])
-   *
-   * Asserts that `value` is a string.
-   *
-   *     var teaOrder = 'chai';
-   *     assert.isString(teaOrder, 'order placed');
-   *
-   * @name isString
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isString = function (val, msg) {
-    new Assertion(val, msg).to.be.a('string');
-  };
-
-  /**
-   * ### .isNotString(value, [message])
-   *
-   * Asserts that `value` is _not_ a string.
-   *
-   *     var teaOrder = 4;
-   *     assert.isNotString(teaOrder, 'order placed');
-   *
-   * @name isNotString
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isNotString = function (val, msg) {
-    new Assertion(val, msg).to.not.be.a('string');
-  };
-
-  /**
-   * ### .isNumber(value, [message])
-   *
-   * Asserts that `value` is a number.
-   *
-   *     var cups = 2;
-   *     assert.isNumber(cups, 'how many cups');
-   *
-   * @name isNumber
-   * @param {Number} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isNumber = function (val, msg) {
-    new Assertion(val, msg).to.be.a('number');
-  };
-
-  /**
-   * ### .isNotNumber(value, [message])
-   *
-   * Asserts that `value` is _not_ a number.
-   *
-   *     var cups = '2 cups please';
-   *     assert.isNotNumber(cups, 'how many cups');
-   *
-   * @name isNotNumber
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isNotNumber = function (val, msg) {
-    new Assertion(val, msg).to.not.be.a('number');
-  };
-
-  /**
-   * ### .isBoolean(value, [message])
-   *
-   * Asserts that `value` is a boolean.
-   *
-   *     var teaReady = true
-   *       , teaServed = false;
-   *
-   *     assert.isBoolean(teaReady, 'is the tea ready');
-   *     assert.isBoolean(teaServed, 'has tea been served');
-   *
-   * @name isBoolean
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isBoolean = function (val, msg) {
-    new Assertion(val, msg).to.be.a('boolean');
-  };
-
-  /**
-   * ### .isNotBoolean(value, [message])
-   *
-   * Asserts that `value` is _not_ a boolean.
-   *
-   *     var teaReady = 'yep'
-   *       , teaServed = 'nope';
-   *
-   *     assert.isNotBoolean(teaReady, 'is the tea ready');
-   *     assert.isNotBoolean(teaServed, 'has tea been served');
-   *
-   * @name isNotBoolean
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.isNotBoolean = function (val, msg) {
-    new Assertion(val, msg).to.not.be.a('boolean');
-  };
-
-  /**
-   * ### .typeOf(value, name, [message])
-   *
-   * Asserts that `value`'s type is `name`, as determined by
-   * `Object.prototype.toString`.
-   *
-   *     assert.typeOf({ tea: 'chai' }, 'object', 'we have an object');
-   *     assert.typeOf(['chai', 'jasmine'], 'array', 'we have an array');
-   *     assert.typeOf('tea', 'string', 'we have a string');
-   *     assert.typeOf(/tea/, 'regexp', 'we have a regular expression');
-   *     assert.typeOf(null, 'null', 'we have a null');
-   *     assert.typeOf(undefined, 'undefined', 'we have an undefined');
-   *
-   * @name typeOf
-   * @param {Mixed} value
-   * @param {String} name
-   * @param {String} message
-   * @api public
-   */
-
-  assert.typeOf = function (val, type, msg) {
-    new Assertion(val, msg).to.be.a(type);
-  };
-
-  /**
-   * ### .notTypeOf(value, name, [message])
-   *
-   * Asserts that `value`'s type is _not_ `name`, as determined by
-   * `Object.prototype.toString`.
-   *
-   *     assert.notTypeOf('tea', 'number', 'strings are not numbers');
-   *
-   * @name notTypeOf
-   * @param {Mixed} value
-   * @param {String} typeof name
-   * @param {String} message
-   * @api public
-   */
-
-  assert.notTypeOf = function (val, type, msg) {
-    new Assertion(val, msg).to.not.be.a(type);
-  };
-
-  /**
-   * ### .instanceOf(object, constructor, [message])
-   *
-   * Asserts that `value` is an instance of `constructor`.
-   *
-   *     var Tea = function (name) { this.name = name; }
-   *       , chai = new Tea('chai');
-   *
-   *     assert.instanceOf(chai, Tea, 'chai is an instance of tea');
-   *
-   * @name instanceOf
-   * @param {Object} object
-   * @param {Constructor} constructor
-   * @param {String} message
-   * @api public
-   */
-
-  assert.instanceOf = function (val, type, msg) {
-    new Assertion(val, msg).to.be.instanceOf(type);
-  };
-
-  /**
-   * ### .notInstanceOf(object, constructor, [message])
-   *
-   * Asserts `value` is not an instance of `constructor`.
-   *
-   *     var Tea = function (name) { this.name = name; }
-   *       , chai = new String('chai');
-   *
-   *     assert.notInstanceOf(chai, Tea, 'chai is not an instance of tea');
-   *
-   * @name notInstanceOf
-   * @param {Object} object
-   * @param {Constructor} constructor
-   * @param {String} message
-   * @api public
-   */
-
-  assert.notInstanceOf = function (val, type, msg) {
-    new Assertion(val, msg).to.not.be.instanceOf(type);
-  };
-
-  /**
-   * ### .include(haystack, needle, [message])
-   *
-   * Asserts that `haystack` includes `needle`. Works
-   * for strings and arrays.
-   *
-   *     assert.include('foobar', 'bar', 'foobar contains string "bar"');
-   *     assert.include([ 1, 2, 3 ], 3, 'array contains value');
-   *
-   * @name include
-   * @param {Array|String} haystack
-   * @param {Mixed} needle
-   * @param {String} message
-   * @api public
-   */
-
-  assert.include = function (exp, inc, msg) {
-    var obj = new Assertion(exp, msg);
-
-    if (Array.isArray(exp)) {
-      obj.to.include(inc);
-    } else if ('string' === typeof exp) {
-      obj.to.contain.string(inc);
-    }
-  };
-
-  /**
-   * ### .match(value, regexp, [message])
-   *
-   * Asserts that `value` matches the regular expression `regexp`.
-   *
-   *     assert.match('foobar', /^foo/, 'regexp matches');
-   *
-   * @name match
-   * @param {Mixed} value
-   * @param {RegExp} regexp
-   * @param {String} message
-   * @api public
-   */
-
-  assert.match = function (exp, re, msg) {
-    new Assertion(exp, msg).to.match(re);
-  };
-
-  /**
-   * ### .notMatch(value, regexp, [message])
-   *
-   * Asserts that `value` does not match the regular expression `regexp`.
-   *
-   *     assert.notMatch('foobar', /^foo/, 'regexp does not match');
-   *
-   * @name notMatch
-   * @param {Mixed} value
-   * @param {RegExp} regexp
-   * @param {String} message
-   * @api public
-   */
-
-  assert.notMatch = function (exp, re, msg) {
-    new Assertion(exp, msg).to.not.match(re);
-  };
-
-  /**
-   * ### .property(object, property, [message])
-   *
-   * Asserts that `object` has a property named by `property`.
-   *
-   *     assert.property({ tea: { green: 'matcha' }}, 'tea');
-   *
-   * @name property
-   * @param {Object} object
-   * @param {String} property
-   * @param {String} message
-   * @api public
-   */
-
-  assert.property = function (obj, prop, msg) {
-    new Assertion(obj, msg).to.have.property(prop);
-  };
-
-  /**
-   * ### .notProperty(object, property, [message])
-   *
-   * Asserts that `object` does _not_ have a property named by `property`.
-   *
-   *     assert.notProperty({ tea: { green: 'matcha' }}, 'coffee');
-   *
-   * @name notProperty
-   * @param {Object} object
-   * @param {String} property
-   * @param {String} message
-   * @api public
-   */
-
-  assert.notProperty = function (obj, prop, msg) {
-    new Assertion(obj, msg).to.not.have.property(prop);
-  };
-
-  /**
-   * ### .deepProperty(object, property, [message])
-   *
-   * Asserts that `object` has a property named by `property`, which can be a
-   * string using dot- and bracket-notation for deep reference.
-   *
-   *     assert.deepProperty({ tea: { green: 'matcha' }}, 'tea.green');
-   *
-   * @name deepProperty
-   * @param {Object} object
-   * @param {String} property
-   * @param {String} message
-   * @api public
-   */
-
-  assert.deepProperty = function (obj, prop, msg) {
-    new Assertion(obj, msg).to.have.deep.property(prop);
-  };
-
-  /**
-   * ### .notDeepProperty(object, property, [message])
-   *
-   * Asserts that `object` does _not_ have a property named by `property`, which
-   * can be a string using dot- and bracket-notation for deep reference.
-   *
-   *     assert.notDeepProperty({ tea: { green: 'matcha' }}, 'tea.oolong');
-   *
-   * @name notDeepProperty
-   * @param {Object} object
-   * @param {String} property
-   * @param {String} message
-   * @api public
-   */
-
-  assert.notDeepProperty = function (obj, prop, msg) {
-    new Assertion(obj, msg).to.not.have.deep.property(prop);
-  };
-
-  /**
-   * ### .propertyVal(object, property, value, [message])
-   *
-   * Asserts that `object` has a property named by `property` with value given
-   * by `value`.
-   *
-   *     assert.propertyVal({ tea: 'is good' }, 'tea', 'is good');
-   *
-   * @name propertyVal
-   * @param {Object} object
-   * @param {String} property
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.propertyVal = function (obj, prop, val, msg) {
-    new Assertion(obj, msg).to.have.property(prop, val);
-  };
-
-  /**
-   * ### .propertyNotVal(object, property, value, [message])
-   *
-   * Asserts that `object` has a property named by `property`, but with a value
-   * different from that given by `value`.
-   *
-   *     assert.propertyNotVal({ tea: 'is good' }, 'tea', 'is bad');
-   *
-   * @name propertyNotVal
-   * @param {Object} object
-   * @param {String} property
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.propertyNotVal = function (obj, prop, val, msg) {
-    new Assertion(obj, msg).to.not.have.property(prop, val);
-  };
-
-  /**
-   * ### .deepPropertyVal(object, property, value, [message])
-   *
-   * Asserts that `object` has a property named by `property` with value given
-   * by `value`. `property` can use dot- and bracket-notation for deep
-   * reference.
-   *
-   *     assert.deepPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'matcha');
-   *
-   * @name deepPropertyVal
-   * @param {Object} object
-   * @param {String} property
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.deepPropertyVal = function (obj, prop, val, msg) {
-    new Assertion(obj, msg).to.have.deep.property(prop, val);
-  };
-
-  /**
-   * ### .deepPropertyNotVal(object, property, value, [message])
-   *
-   * Asserts that `object` has a property named by `property`, but with a value
-   * different from that given by `value`. `property` can use dot- and
-   * bracket-notation for deep reference.
-   *
-   *     assert.deepPropertyNotVal({ tea: { green: 'matcha' }}, 'tea.green', 'konacha');
-   *
-   * @name deepPropertyNotVal
-   * @param {Object} object
-   * @param {String} property
-   * @param {Mixed} value
-   * @param {String} message
-   * @api public
-   */
-
-  assert.deepPropertyNotVal = function (obj, prop, val, msg) {
-    new Assertion(obj, msg).to.not.have.deep.property(prop, val);
-  };
-
-  /**
-   * ### .lengthOf(object, length, [message])
-   *
-   * Asserts that `object` has a `length` property with the expected value.
-   *
-   *     assert.lengthOf([1,2,3], 3, 'array has length of 3');
-   *     assert.lengthOf('foobar', 5, 'string has length of 6');
-   *
-   * @name lengthOf
-   * @param {Mixed} object
-   * @param {Number} length
-   * @param {String} message
-   * @api public
-   */
-
-  assert.lengthOf = function (exp, len, msg) {
-    new Assertion(exp, msg).to.have.length(len);
-  };
-
-  /**
-   * ### .throws(function, [constructor/regexp], [message])
-   *
-   * Asserts that `function` will throw an error that is an instance of
-   * `constructor`, or alternately that it will throw an error with message
-   * matching `regexp`.
-   *
-   *     assert.throw(fn, ReferenceError, 'function throws a reference error');
-   *
-   * @name throws
-   * @alias throw
-   * @alias Throw
-   * @param {Function} function
-   * @param {ErrorConstructor} constructor
-   * @param {RegExp} regexp
-   * @param {String} message
-   * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
-   * @api public
-   */
-
-  assert.Throw = function (fn, type, msg) {
-    if ('string' === typeof type) {
-      msg = type;
-      type = null;
-    }
-
-    new Assertion(fn, msg).to.Throw(type);
-  };
-
-  /**
-   * ### .doesNotThrow(function, [constructor/regexp], [message])
-   *
-   * Asserts that `function` will _not_ throw an error that is an instance of
-   * `constructor`, or alternately that it will not throw an error with message
-   * matching `regexp`.
-   *
-   *     assert.doesNotThrow(fn, Error, 'function does not throw');
-   *
-   * @name doesNotThrow
-   * @param {Function} function
-   * @param {ErrorConstructor} constructor
-   * @param {RegExp} regexp
-   * @param {String} message
-   * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
-   * @api public
-   */
-
-  assert.doesNotThrow = function (fn, type, msg) {
-    if ('string' === typeof type) {
-      msg = type;
-      type = null;
-    }
-
-    new Assertion(fn, msg).to.not.Throw(type);
-  };
-
-  /**
-   * ### .operator(val1, operator, val2, [message])
-   *
-   * Compares two values using `operator`.
-   *
-   *     assert.operator(1, '<', 2, 'everything is ok');
-   *     assert.operator(1, '>', 2, 'this will fail');
-   *
-   * @name operator
-   * @param {Mixed} val1
-   * @param {String} operator
-   * @param {Mixed} val2
-   * @param {String} message
-   * @api public
-   */
-
-  assert.operator = function (val, operator, val2, msg) {
-    if (!~['==', '===', '>', '>=', '<', '<=', '!=', '!=='].indexOf(operator)) {
-      throw new Error('Invalid operator "' + operator + '"');
-    }
-    var test = new Assertion(eval(val + operator + val2), msg);
-    test.assert(
-        true === flag(test, 'object')
-      , 'expected ' + util.inspect(val) + ' to be ' + operator + ' ' + util.inspect(val2)
-      , 'expected ' + util.inspect(val) + ' to not be ' + operator + ' ' + util.inspect(val2) );
-  };
-
-  /*!
-   * Undocumented / untested
-   */
-
-  assert.ifError = function (val, msg) {
-    new Assertion(val, msg).to.not.be.ok;
-  };
-
-  /*!
-   * Aliases.
-   */
-
-  (function alias(name, as){
-    assert[as] = assert[name];
-    return alias;
-  })
-  ('Throw', 'throw')
-  ('Throw', 'throws');
-};
-
-}); // module: chai/interface/assert.js
-
-require.register("chai/interface/expect.js", function(module, exports, require){
-/*!
- * chai
- * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-module.exports = function (chai, util) {
-  chai.expect = function (val, message) {
-    return new chai.Assertion(val, message);
-  };
-};
-
-
-}); // module: chai/interface/expect.js
-
-require.register("chai/interface/should.js", function(module, exports, require){
-/*!
- * chai
- * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-module.exports = function (chai, util) {
-  var Assertion = chai.Assertion;
-
-  function loadShould () {
-    // modify Object.prototype to have `should`
-    Object.defineProperty(Object.prototype, 'should',
-      { set: function () {}
-      , get: function(){
-          if (this instanceof String || this instanceof Number) {
-            return new Assertion(this.constructor(this));
-          } else if (this instanceof Boolean) {
-            return new Assertion(this == true);
-          }
-          return new Assertion(this);
+    };
+
+    /*!
+     * ### ._obj
+     *
+     * Quick reference to stored `actual` value for plugin developers.
+     *
+     * @api private
+     */
+
+    Object.defineProperty(Assertion.prototype, '_obj',
+      { get: function () {
+          return flag(this, 'object');
+        }
+      , set: function (val) {
+          flag(this, 'object', val);
         }
-      , configurable: true
     });
 
-    var should = {};
+  }); // module: chai/assertion.js
 
-    should.equal = function (val1, val2) {
-      new Assertion(val1).to.equal(val2);
-    };
+  require.register("chai/browser/error.js", function(module, exports, require){
+    /*!
+     * chai
+     * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
 
-    should.Throw = function (fn, errt, errs) {
-      new Assertion(fn).to.Throw(errt, errs);
-    };
+    module.exports = AssertionError;
 
-    should.exist = function (val) {
-      new Assertion(val).to.exist;
+    function AssertionError (options) {
+      options = options || {};
+      this.message = options.message;
+      this.actual = options.actual;
+      this.expected = options.expected;
+      this.operator = options.operator;
+
+      if (options.stackStartFunction && Error.captureStackTrace) {
+        var stackStartFunction = options.stackStartFunction;
+        Error.captureStackTrace(this, stackStartFunction);
+      }
     }
 
-    // negation
-    should.not = {}
+    AssertionError.prototype = Object.create(Error.prototype);
+    AssertionError.prototype.name = 'AssertionError';
+    AssertionError.prototype.constructor = AssertionError;
 
-    should.not.equal = function (val1, val2) {
-      new Assertion(val1).to.not.equal(val2);
+    AssertionError.prototype.toString = function() {
+      return this.message;
     };
 
-    should.not.Throw = function (fn, errt, errs) {
-      new Assertion(fn).to.not.Throw(errt, errs);
-    };
+  }); // module: chai/browser/error.js
 
-    should.not.exist = function (val) {
-      new Assertion(val).to.not.exist;
-    }
+  require.register("chai/core/assertions.js", function(module, exports, require){
+    /*!
+     * chai
+     * http://chaijs.com
+     * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
 
-    should['throw'] = should['Throw'];
-    should.not['throw'] = should.not['Throw'];
+    module.exports = function (chai, _) {
+      var Assertion = chai.Assertion
+        , toString = Object.prototype.toString
+        , flag = _.flag;
 
-    return should;
-  };
+      /**
+       * ### Language Chains
+       *
+       * The following are provide as chainable getters to
+       * improve the readability of your assertions. They
+       * do not provide an testing capability unless they
+       * have been overwritten by a plugin.
+       *
+       * **Chains**
+       *
+       * - to
+       * - be
+       * - been
+       * - is
+       * - that
+       * - and
+       * - have
+       * - with
+       *
+       * @name language chains
+       * @api public
+       */
 
-  chai.should = loadShould;
-  chai.Should = loadShould;
-};
+      [ 'to', 'be', 'been'
+      , 'is', 'and', 'have'
+      , 'with', 'that' ].forEach(function (chain) {
+        Assertion.addProperty(chain, function () {
+          return this;
+        });
+      });
 
-}); // module: chai/interface/should.js
+      /**
+       * ### .not
+       *
+       * Negates any of assertions following in the chain.
+       *
+       *     expect(foo).to.not.equal('bar');
+       *     expect(goodFn).to.not.throw(Error);
+       *     expect({ foo: 'baz' }).to.have.property('foo')
+       *       .and.not.equal('bar');
+       *
+       * @name not
+       * @api public
+       */
 
-require.register("chai/utils/addChainableMethod.js", function(module, exports, require){
-/*!
- * Chai - addChainingMethod utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
+      Assertion.addProperty('not', function () {
+        flag(this, 'negate', true);
+      });
 
-/*!
- * Module dependencies
- */
+      /**
+       * ### .deep
+       *
+       * Sets the `deep` flag, later used by the `equal` and
+       * `property` assertions.
+       *
+       *     expect(foo).to.deep.equal({ bar: 'baz' });
+       *     expect({ foo: { bar: { baz: 'quux' } } })
+       *       .to.have.deep.property('foo.bar.baz', 'quux');
+       *
+       * @name deep
+       * @api public
+       */
 
-var transferFlags = require('./transferFlags');
+      Assertion.addProperty('deep', function () {
+        flag(this, 'deep', true);
+      });
 
-/**
- * ### addChainableMethod (ctx, name, method, chainingBehavior)
- *
- * Adds a method to an object, such that the method can also be chained.
- *
- *     utils.addChainableMethod(chai.Assertion.prototype, 'foo', function (str) {
- *       var obj = utils.flag(this, 'object');
- *       new chai.Assertion(obj).to.be.equal(str);
- *     });
- *
- * Can also be accessed directly from `chai.Assertion`.
- *
- *     chai.Assertion.addChainableMethod('foo', fn, chainingBehavior);
- *
- * The result can then be used as both a method assertion, executing both `method` and
- * `chainingBehavior`, or as a language chain, which only executes `chainingBehavior`.
- *
- *     expect(fooStr).to.be.foo('bar');
- *     expect(fooStr).to.be.foo.equal('foo');
- *
- * @param {Object} ctx object to which the method is added
- * @param {String} name of method to add
- * @param {Function} method function to be used for `name`, when called
- * @param {Function} chainingBehavior function to be called every time the property is accessed
- * @name addChainableMethod
- * @api public
- */
+      /**
+       * ### .a(type)
+       *
+       * The `a` and `an` assertions are aliases that can be
+       * used either as language chains or to assert a value's
+       * type (as revealed by `Object.prototype.toString`).
+       *
+       *     // typeof
+       *     expect('test').to.be.a('string');
+       *     expect({ foo: 'bar' }).to.be.an('object');
+       *     expect(null).to.be.a('null');
+       *     expect(undefined).to.be.an('undefined');
+       *
+       *     // language chain
+       *     expect(foo).to.be.an.instanceof(Foo);
+       *
+       * @name a
+       * @alias an
+       * @param {String} type
+       * @api public
+       */
 
-module.exports = function (ctx, name, method, chainingBehavior) {
-  if (typeof chainingBehavior !== 'function')
-    chainingBehavior = function () { };
+      function an(type) {
+        var obj = flag(this, 'object')
+          , klassStart = type.charAt(0).toUpperCase()
+          , klass = klassStart + type.slice(1)
+          , article = ~[ 'A', 'E', 'I', 'O', 'U' ].indexOf(klassStart) ? 'an ' : 'a ';
 
-  Object.defineProperty(ctx, name,
-    { get: function () {
-        chainingBehavior.call(this);
+        this.assert(
+            '[object ' + klass + ']' === toString.call(obj)
+          , 'expected #{this} to be ' + article + type
+          , 'expected #{this} not to be ' + article + type
+        );
+      }
 
-        var assert = function () {
-          var result = method.apply(this, arguments);
-          return result === undefined ? this : result;
-        };
+      Assertion.addChainableMethod('an', an);
+      Assertion.addChainableMethod('a', an);
 
-        // Re-enumerate every time to better accomodate plugins.
-        var asserterNames = Object.getOwnPropertyNames(ctx);
-        asserterNames.forEach(function (asserterName) {
-          var pd = Object.getOwnPropertyDescriptor(ctx, asserterName)
-            , functionProtoPD = Object.getOwnPropertyDescriptor(Function.prototype, asserterName);
-          // Avoid trying to overwrite things that we can't, like `length` and `arguments`.
-          if (functionProtoPD && !functionProtoPD.configurable) return;
-          if (asserterName === 'arguments') return; // @see chaijs/chai/issues/69
-          Object.defineProperty(assert, asserterName, pd);
+      /**
+       * ### .include(value)
+       *
+       * The `include` and `contain` assertions can be used as either property
+       * based language chains or as methods to assert the inclusion of an object
+       * in an array or a substring in a string. When used as language chains,
+       * they toggle the `contain` flag for the `keys` assertion.
+       *
+       *     expect([1,2,3]).to.include(2);
+       *     expect('foobar').to.contain('foo');
+       *     expect({ foo: 'bar', hello: 'universe' }).to.include.keys('foo');
+       *
+       * @name include
+       * @alias contain
+       * @param {Object|String|Number} obj
+       * @api public
+       */
+
+      function includeChainingBehavior () {
+        flag(this, 'contains', true);
+      }
+
+      function include (val) {
+        var obj = flag(this, 'object')
+        this.assert(
+            ~obj.indexOf(val)
+          , 'expected #{this} to include ' + _.inspect(val)
+          , 'expected #{this} to not include ' + _.inspect(val));
+      }
+
+      Assertion.addChainableMethod('include', include, includeChainingBehavior);
+      Assertion.addChainableMethod('contain', include, includeChainingBehavior);
+
+      /**
+       * ### .ok
+       *
+       * Asserts that the target is truthy.
+       *
+       *     expect('everthing').to.be.ok;
+       *     expect(1).to.be.ok;
+       *     expect(false).to.not.be.ok;
+       *     expect(undefined).to.not.be.ok;
+       *     expect(null).to.not.be.ok;
+       *
+       * @name ok
+       * @api public
+       */
+
+      Assertion.addProperty('ok', function () {
+        this.assert(
+            flag(this, 'object')
+          , 'expected #{this} to be truthy'
+          , 'expected #{this} to be falsy');
+      });
+
+      /**
+       * ### .true
+       *
+       * Asserts that the target is `true`.
+       *
+       *     expect(true).to.be.true;
+       *     expect(1).to.not.be.true;
+       *
+       * @name true
+       * @api public
+       */
+
+      Assertion.addProperty('true', function () {
+        this.assert(
+            true === flag(this, 'object')
+          , 'expected #{this} to be true'
+          , 'expected #{this} to be false'
+          , this.negate ? false : true
+        );
+      });
+
+      /**
+       * ### .false
+       *
+       * Asserts that the target is `false`.
+       *
+       *     expect(false).to.be.false;
+       *     expect(0).to.not.be.false;
+       *
+       * @name false
+       * @api public
+       */
+
+      Assertion.addProperty('false', function () {
+        this.assert(
+            false === flag(this, 'object')
+          , 'expected #{this} to be false'
+          , 'expected #{this} to be true'
+          , this.negate ? true : false
+        );
+      });
+
+      /**
+       * ### .null
+       *
+       * Asserts that the target is `null`.
+       *
+       *     expect(null).to.be.null;
+       *     expect(undefined).not.to.be.null;
+       *
+       * @name null
+       * @api public
+       */
+
+      Assertion.addProperty('null', function () {
+        this.assert(
+            null === flag(this, 'object')
+          , 'expected #{this} to be null'
+          , 'expected #{this} not to be null'
+        );
+      });
+
+      /**
+       * ### .undefined
+       *
+       * Asserts that the target is `undefined`.
+       *
+       *      expect(undefined).to.be.undefined;
+       *      expect(null).to.not.be.undefined;
+       *
+       * @name undefined
+       * @api public
+       */
+
+      Assertion.addProperty('undefined', function () {
+        this.assert(
+            undefined === flag(this, 'object')
+          , 'expected #{this} to be undefined'
+          , 'expected #{this} not to be undefined'
+        );
+      });
+
+      /**
+       * ### .exist
+       *
+       * Asserts that the target is neither `null` nor `undefined`.
+       *
+       *     var foo = 'hi'
+       *       , bar = null
+       *       , baz;
+       *
+       *     expect(foo).to.exist;
+       *     expect(bar).to.not.exist;
+       *     expect(baz).to.not.exist;
+       *
+       * @name exist
+       * @api public
+       */
+
+      Assertion.addProperty('exist', function () {
+        this.assert(
+            null != flag(this, 'object')
+          , 'expected #{this} to exist'
+          , 'expected #{this} to not exist'
+        );
+      });
+
+
+      /**
+       * ### .empty
+       *
+       * Asserts that the target's length is `0`. For arrays, it checks
+       * the `length` property. For objects, it gets the count of
+       * enumerable keys.
+       *
+       *     expect([]).to.be.empty;
+       *     expect('').to.be.empty;
+       *     expect({}).to.be.empty;
+       *
+       * @name empty
+       * @api public
+       */
+
+      Assertion.addProperty('empty', function () {
+        var obj = flag(this, 'object')
+          , expected = obj;
+
+        if (Array.isArray(obj) || 'string' === typeof object) {
+          expected = obj.length;
+        } else if (typeof obj === 'object') {
+          expected = Object.keys(obj).length;
+        }
+
+        this.assert(
+            !expected
+          , 'expected #{this} to be empty'
+          , 'expected #{this} not to be empty'
+        );
+      });
+
+      /**
+       * ### .arguments
+       *
+       * Asserts that the target is an arguments object.
+       *
+       *     function test () {
+       *       expect(arguments).to.be.arguments;
+       *     }
+       *
+       * @name arguments
+       * @alias Arguments
+       * @api public
+       */
+
+      function checkArguments () {
+        var obj = flag(this, 'object')
+          , type = Object.prototype.toString.call(obj);
+        this.assert(
+            '[object Arguments]' === type
+          , 'expected #{this} to be arguments but got ' + type
+          , 'expected #{this} to not be arguments'
+        );
+      }
+
+      Assertion.addProperty('arguments', checkArguments);
+      Assertion.addProperty('Arguments', checkArguments);
+
+      /**
+       * ### .equal(value)
+       *
+       * Asserts that the target is strictly equal (`===`) to `value`.
+       * Alternately, if the `deep` flag is set, asserts that
+       * the target is deeply equal to `value`.
+       *
+       *     expect('hello').to.equal('hello');
+       *     expect(42).to.equal(42);
+       *     expect(1).to.not.equal(true);
+       *     expect({ foo: 'bar' }).to.not.equal({ foo: 'bar' });
+       *     expect({ foo: 'bar' }).to.deep.equal({ foo: 'bar' });
+       *
+       * @name equal
+       * @alias eq
+       * @alias deep.equal
+       * @param {Mixed} value
+       * @api public
+       */
+
+      function assertEqual (val) {
+        var obj = flag(this, 'object');
+        if (flag(this, 'deep')) {
+          return this.eql(val);
+        } else {
+          this.assert(
+              val === obj
+            , 'expected #{this} to equal #{exp}'
+            , 'expected #{this} to not equal #{exp}'
+            , val
+          );
+        }
+      }
+
+      Assertion.addMethod('equal', assertEqual);
+      Assertion.addMethod('eq', assertEqual);
+
+      /**
+       * ### .eql(value)
+       *
+       * Asserts that the target is deeply equal to `value`.
+       *
+       *     expect({ foo: 'bar' }).to.eql({ foo: 'bar' });
+       *     expect([ 1, 2, 3 ]).to.eql([ 1, 2, 3 ]);
+       *
+       * @name eql
+       * @param {Mixed} value
+       * @api public
+       */
+
+      Assertion.addMethod('eql', function (obj) {
+        this.assert(
+            _.eql(obj, flag(this, 'object'))
+          , 'expected #{this} to deeply equal #{exp}'
+          , 'expected #{this} to not deeply equal #{exp}'
+          , obj
+        );
+      });
+
+      /**
+       * ### .above(value)
+       *
+       * Asserts that the target is greater than `value`.
+       *
+       *     expect(10).to.be.above(5);
+       *
+       * Can also be used in conjunction with `length` to
+       * assert a minimum length. The benefit being a
+       * more informative error message than if the length
+       * was supplied directly.
+       *
+       *     expect('foo').to.have.length.above(2);
+       *     expect([ 1, 2, 3 ]).to.have.length.above(2);
+       *
+       * @name above
+       * @alias gt
+       * @alias greaterThan
+       * @param {Number} value
+       * @api public
+       */
+
+      function assertAbove (n) {
+        var obj = flag(this, 'object');
+        if (flag(this, 'doLength')) {
+          new Assertion(obj).to.have.property('length');
+          var len = obj.length;
+          this.assert(
+              len > n
+            , 'expected #{this} to have a length above #{exp} but got #{act}'
+            , 'expected #{this} to not have a length above #{exp}'
+            , n
+            , len
+          );
+        } else {
+          this.assert(
+              obj > n
+            , 'expected #{this} to be above ' + n
+            , 'expected #{this} to be below ' + n
+          );
+        }
+      }
+
+      Assertion.addMethod('above', assertAbove);
+      Assertion.addMethod('gt', assertAbove);
+      Assertion.addMethod('greaterThan', assertAbove);
+
+      /**
+       * ### .below(value)
+       *
+       * Asserts that the target is less than `value`.
+       *
+       *     expect(5).to.be.below(10);
+       *
+       * Can also be used in conjunction with `length` to
+       * assert a maximum length. The benefit being a
+       * more informative error message than if the length
+       * was supplied directly.
+       *
+       *     expect('foo').to.have.length.below(4);
+       *     expect([ 1, 2, 3 ]).to.have.length.below(4);
+       *
+       * @name below
+       * @alias lt
+       * @alias lessThan
+       * @param {Number} value
+       * @api public
+       */
+
+      function assertBelow (n) {
+        var obj = flag(this, 'object');
+        if (flag(this, 'doLength')) {
+          new Assertion(obj).to.have.property('length');
+          var len = obj.length;
+          this.assert(
+              len < n
+            , 'expected #{this} to have a length below #{exp} but got #{act}'
+            , 'expected #{this} to not have a length below #{exp}'
+            , n
+            , len
+          );
+        } else {
+          this.assert(
+              obj < n
+            , 'expected #{this} to be below ' + n
+            , 'expected #{this} to be above ' + n
+          );
+        }
+      }
+
+      Assertion.addMethod('below', assertBelow);
+      Assertion.addMethod('lt', assertBelow);
+      Assertion.addMethod('lessThan', assertBelow);
+
+      /**
+       * ### .within(start, finish)
+       *
+       * Asserts that the target is within a range.
+       *
+       *     expect(7).to.be.within(5,10);
+       *
+       * Can also be used in conjunction with `length` to
+       * assert a length range. The benefit being a
+       * more informative error message than if the length
+       * was supplied directly.
+       *
+       *     expect('foo').to.have.length.within(2,4);
+       *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);
+       *
+       * @name within
+       * @param {Number} start lowerbound inclusive
+       * @param {Number} finish upperbound inclusive
+       * @api public
+       */
+
+      Assertion.addMethod('within', function (start, finish) {
+        var obj = flag(this, 'object')
+          , range = start + '..' + finish;
+        if (flag(this, 'doLength')) {
+          new Assertion(obj).to.have.property('length');
+          var len = obj.length;
+          this.assert(
+              len >= start && len <= finish
+            , 'expected #{this} to have a length within ' + range
+            , 'expected #{this} to not have a length within ' + range
+          );
+        } else {
+          this.assert(
+              obj >= start && obj <= finish
+            , 'expected #{this} to be within ' + range
+            , 'expected #{this} to not be within ' + range
+          );
+        }
+      });
+
+      /**
+       * ### .instanceof(constructor)
+       *
+       * Asserts that the target is an instance of `constructor`.
+       *
+       *     var Tea = function (name) { this.name = name; }
+       *       , Chai = new Tea('chai');
+       *
+       *     expect(Chai).to.be.an.instanceof(Tea);
+       *     expect([ 1, 2, 3 ]).to.be.instanceof(Array);
+       *
+       * @name instanceof
+       * @param {Constructor} constructor
+       * @alias instanceOf
+       * @api public
+       */
+
+      function assertInstanceOf (constructor) {
+        var name = _.getName(constructor);
+        this.assert(
+            flag(this, 'object') instanceof constructor
+          , 'expected #{this} to be an instance of ' + name
+          , 'expected #{this} to not be an instance of ' + name
+        );
+      };
+
+      Assertion.addMethod('instanceof', assertInstanceOf);
+      Assertion.addMethod('instanceOf', assertInstanceOf);
+
+      /**
+       * ### .property(name, [value])
+       *
+       * Asserts that the target has a property `name`, optionally asserting that
+       * the value of that property is strictly equal to  `value`.
+       * If the `deep` flag is set, you can use dot- and bracket-notation for deep
+       * references into objects and arrays.
+       *
+       *     // simple referencing
+       *     var obj = { foo: 'bar' };
+       *     expect(obj).to.have.property('foo');
+       *     expect(obj).to.have.property('foo', 'bar');
+       *
+       *     // deep referencing
+       *     var deepObj = {
+       *         green: { tea: 'matcha' }
+       *       , teas: [ 'chai', 'matcha', { tea: 'konacha' } ]
+       *     };
+
+       *     expect(deepObj).to.have.deep.property('green.tea', 'matcha');
+       *     expect(deepObj).to.have.deep.property('teas[1]', 'matcha');
+       *     expect(deepObj).to.have.deep.property('teas[2].tea', 'konacha');
+       *
+       * You can also use an array as the starting point of a `deep.property`
+       * assertion, or traverse nested arrays.
+       *
+       *     var arr = [
+       *         [ 'chai', 'matcha', 'konacha' ]
+       *       , [ { tea: 'chai' }
+       *         , { tea: 'matcha' }
+       *         , { tea: 'konacha' } ]
+       *     ];
+       *
+       *     expect(arr).to.have.deep.property('[0][1]', 'matcha');
+       *     expect(arr).to.have.deep.property('[1][2].tea', 'konacha');
+       *
+       * Furthermore, `property` changes the subject of the assertion
+       * to be the value of that property from the original object. This
+       * permits for further chainable assertions on that property.
+       *
+       *     expect(obj).to.have.property('foo')
+       *       .that.is.a('string');
+       *     expect(deepObj).to.have.property('green')
+       *       .that.is.an('object')
+       *       .that.deep.equals({ tea: 'matcha' });
+       *     expect(deepObj).to.have.property('teas')
+       *       .that.is.an('array')
+       *       .with.deep.property('[2]')
+       *         .that.deep.equals({ tea: 'konacha' });
+       *
+       * @name property
+       * @alias deep.property
+       * @param {String} name
+       * @param {Mixed} value (optional)
+       * @returns value of property for chaining
+       * @api public
+       */
+
+      Assertion.addMethod('property', function (name, val) {
+        var obj = flag(this, 'object')
+          , value = flag(this, 'deep') ? _.getPathValue(name, obj) : obj[name]
+          , descriptor = flag(this, 'deep') ? 'deep property ' : 'property '
+          , negate = flag(this, 'negate');
+
+        if (negate && undefined !== val) {
+          if (undefined === value) {
+            throw new Error(_.inspect(obj) + ' has no ' + descriptor + _.inspect(name));
+          }
+        } else {
+          this.assert(
+              undefined !== value
+            , 'expected #{this} to have a ' + descriptor + _.inspect(name)
+            , 'expected #{this} to not have ' + descriptor + _.inspect(name));
+        }
+
+        if (undefined !== val) {
+          this.assert(
+              val === value
+            , 'expected #{this} to have a ' + descriptor + _.inspect(name) + ' of #{exp}, but got #{act}'
+            , 'expected #{this} to not have a ' + descriptor + _.inspect(name) + ' of #{act}'
+            , val
+            , value
+          );
+        }
+
+        flag(this, 'object', value);
+      });
+
+
+      /**
+       * ### .ownProperty(name)
+       *
+       * Asserts that the target has an own property `name`.
+       *
+       *     expect('test').to.have.ownProperty('length');
+       *
+       * @name ownProperty
+       * @alias haveOwnProperty
+       * @param {String} name
+       * @api public
+       */
+
+      function assertOwnProperty (name) {
+        var obj = flag(this, 'object');
+        this.assert(
+            obj.hasOwnProperty(name)
+          , 'expected #{this} to have own property ' + _.inspect(name)
+          , 'expected #{this} to not have own property ' + _.inspect(name)
+        );
+      }
+
+      Assertion.addMethod('ownProperty', assertOwnProperty);
+      Assertion.addMethod('haveOwnProperty', assertOwnProperty);
+
+      /**
+       * ### .length(value)
+       *
+       * Asserts that the target's `length` property has
+       * the expected value.
+       *
+       *     expect([ 1, 2, 3]).to.have.length(3);
+       *     expect('foobar').to.have.length(6);
+       *
+       * Can also be used as a chain precursor to a value
+       * comparison for the length property.
+       *
+       *     expect('foo').to.have.length.above(2);
+       *     expect([ 1, 2, 3 ]).to.have.length.above(2);
+       *     expect('foo').to.have.length.below(4);
+       *     expect([ 1, 2, 3 ]).to.have.length.below(4);
+       *     expect('foo').to.have.length.within(2,4);
+       *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);
+       *
+       * @name length
+       * @alias lengthOf
+       * @param {Number} length
+       * @api public
+       */
+
+      function assertLengthChain () {
+        flag(this, 'doLength', true);
+      }
+
+      function assertLength (n) {
+        var obj = flag(this, 'object');
+        new Assertion(obj).to.have.property('length');
+        var len = obj.length;
+
+        this.assert(
+            len == n
+          , 'expected #{this} to have a length of #{exp} but got #{act}'
+          , 'expected #{this} to not have a length of #{act}'
+          , n
+          , len
+        );
+      }
+
+      Assertion.addChainableMethod('length', assertLength, assertLengthChain);
+      Assertion.addMethod('lengthOf', assertLength, assertLengthChain);
+
+      /**
+       * ### .match(regexp)
+       *
+       * Asserts that the target matches a regular expression.
+       *
+       *     expect('foobar').to.match(/^foo/);
+       *
+       * @name match
+       * @param {RegExp} RegularExpression
+       * @api public
+       */
+
+      Assertion.addMethod('match', function (re) {
+        var obj = flag(this, 'object');
+        this.assert(
+            re.exec(obj)
+          , 'expected #{this} to match ' + re
+          , 'expected #{this} not to match ' + re
+        );
+      });
+
+      /**
+       * ### .string(string)
+       *
+       * Asserts that the string target contains another string.
+       *
+       *     expect('foobar').to.have.string('bar');
+       *
+       * @name string
+       * @param {String} string
+       * @api public
+       */
+
+      Assertion.addMethod('string', function (str) {
+        var obj = flag(this, 'object');
+        new Assertion(obj).is.a('string');
+
+        this.assert(
+            ~obj.indexOf(str)
+          , 'expected #{this} to contain ' + _.inspect(str)
+          , 'expected #{this} to not contain ' + _.inspect(str)
+        );
+      });
+
+
+      /**
+       * ### .keys(key1, [key2], [...])
+       *
+       * Asserts that the target has exactly the given keys, or
+       * asserts the inclusion of some keys when using the
+       * `include` or `contain` modifiers.
+       *
+       *     expect({ foo: 1, bar: 2 }).to.have.keys(['foo', 'bar']);
+       *     expect({ foo: 1, bar: 2, baz: 3 }).to.contain.keys('foo', 'bar');
+       *
+       * @name keys
+       * @alias key
+       * @param {String...|Array} keys
+       * @api public
+       */
+
+      function assertKeys (keys) {
+        var obj = flag(this, 'object')
+          , str
+          , ok = true;
+
+        keys = keys instanceof Array
+          ? keys
+          : Array.prototype.slice.call(arguments);
+
+        if (!keys.length) throw new Error('keys required');
+
+        var actual = Object.keys(obj)
+          , len = keys.length;
+
+        // Inclusion
+        ok = keys.every(function(key){
+          return ~actual.indexOf(key);
         });
 
-        transferFlags(this, assert);
-        return assert;
-      }
-    , configurable: true
-  });
-};
-
-}); // module: chai/utils/addChainableMethod.js
-
-require.register("chai/utils/addMethod.js", function(module, exports, require){
-/*!
- * Chai - addMethod utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-/**
- * ### addMethod (ctx, name, method)
- *
- * Adds a method to the prototype of an object.
- *
- *     utils.addMethod(chai.Assertion.prototype, 'foo', function (str) {
- *       var obj = utils.flag(this, 'object');
- *       new chai.Assertion(obj).to.be.equal(str);
- *     });
- *
- * Can also be accessed directly from `chai.Assertion`.
- *
- *     chai.Assertion.addMethod('foo', fn);
- *
- * Then can be used as any other assertion.
- *
- *     expect(fooStr).to.be.foo('bar');
- *
- * @param {Object} ctx object to which the method is added
- * @param {String} name of method to add
- * @param {Function} method function to be used for name
- * @name addMethod
- * @api public
- */
-
-module.exports = function (ctx, name, method) {
-  ctx[name] = function () {
-    var result = method.apply(this, arguments);
-    return result === undefined ? this : result;
-  };
-};
-
-}); // module: chai/utils/addMethod.js
-
-require.register("chai/utils/addProperty.js", function(module, exports, require){
-/*!
- * Chai - addProperty utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-/**
- * ### addProperty (ctx, name, getter)
- *
- * Adds a property to the prototype of an object.
- *
- *     utils.addProperty(chai.Assertion.prototype, 'foo', function () {
- *       var obj = utils.flag(this, 'object');
- *       new chai.Assertion(obj).to.be.instanceof(Foo);
- *     });
- *
- * Can also be accessed directly from `chai.Assertion`.
- *
- *     chai.Assertion.addProperty('foo', fn);
- *
- * Then can be used as any other assertion.
- *
- *     expect(myFoo).to.be.foo;
- *
- * @param {Object} ctx object to which the property is added
- * @param {String} name of property to add
- * @param {Function} getter function to be used for name
- * @name addProperty
- * @api public
- */
-
-module.exports = function (ctx, name, getter) {
-  Object.defineProperty(ctx, name,
-    { get: function () {
-        var result = getter.call(this);
-        return result === undefined ? this : result;
-      }
-    , configurable: true
-  });
-};
-
-}); // module: chai/utils/addProperty.js
-
-require.register("chai/utils/eql.js", function(module, exports, require){
-// This is directly from Node.js assert
-// https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/assert.js
-
-
-module.exports = _deepEqual;
-
-// For browser implementation
-if (!Buffer) {
-  var Buffer = {
-    isBuffer: function () {
-      return false;
-    }
-  };
-}
-
-function _deepEqual(actual, expected) {
-  // 7.1. All identical values are equivalent, as determined by ===.
-  if (actual === expected) {
-    return true;
-
-  } else if (Buffer.isBuffer(actual) && Buffer.isBuffer(expected)) {
-    if (actual.length != expected.length) return false;
-
-    for (var i = 0; i < actual.length; i++) {
-      if (actual[i] !== expected[i]) return false;
-    }
-
-    return true;
-
-  // 7.2. If the expected value is a Date object, the actual value is
-  // equivalent if it is also a Date object that refers to the same time.
-  } else if (actual instanceof Date && expected instanceof Date) {
-    return actual.getTime() === expected.getTime();
-
-  // 7.3. Other pairs that do not both pass typeof value == 'object',
-  // equivalence is determined by ==.
-  } else if (typeof actual != 'object' && typeof expected != 'object') {
-    return actual === expected;
-
-  // 7.4. For all other Object pairs, including Array objects, equivalence is
-  // determined by having the same number of owned properties (as verified
-  // with Object.prototype.hasOwnProperty.call), the same set of keys
-  // (although not necessarily the same order), equivalent values for every
-  // corresponding key, and an identical 'prototype' property. Note: this
-  // accounts for both named and indexed properties on Arrays.
-  } else {
-    return objEquiv(actual, expected);
-  }
-}
-
-function isUndefinedOrNull(value) {
-  return value === null || value === undefined;
-}
-
-function isArguments(object) {
-  return Object.prototype.toString.call(object) == '[object Arguments]';
-}
-
-function objEquiv(a, b) {
-  if (isUndefinedOrNull(a) || isUndefinedOrNull(b))
-    return false;
-  // an identical 'prototype' property.
-  if (a.prototype !== b.prototype) return false;
-  //~~~I've managed to break Object.keys through screwy arguments passing.
-  //   Converting to array solves the problem.
-  if (isArguments(a)) {
-    if (!isArguments(b)) {
-      return false;
-    }
-    a = pSlice.call(a);
-    b = pSlice.call(b);
-    return _deepEqual(a, b);
-  }
-  try {
-    var ka = Object.keys(a),
-        kb = Object.keys(b),
-        key, i;
-  } catch (e) {//happens when one is a string literal and the other isn't
-    return false;
-  }
-  // having the same number of owned properties (keys incorporates
-  // hasOwnProperty)
-  if (ka.length != kb.length)
-    return false;
-  //the same set of keys (although not necessarily the same order),
-  ka.sort();
-  kb.sort();
-  //~~~cheap key test
-  for (i = ka.length - 1; i >= 0; i--) {
-    if (ka[i] != kb[i])
-      return false;
-  }
-  //equivalent values for every corresponding key, and
-  //~~~possibly expensive deep test
-  for (i = ka.length - 1; i >= 0; i--) {
-    key = ka[i];
-    if (!_deepEqual(a[key], b[key])) return false;
-  }
-  return true;
-}
-}); // module: chai/utils/eql.js
-
-require.register("chai/utils/flag.js", function(module, exports, require){
-/*!
- * Chai - flag utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-/**
- * ### flag(object ,key, [value])
- *
- * Get or set a flag value on an object. If a
- * value is provided it will be set, else it will
- * return the currently set value or `undefined` if
- * the value is not set.
- *
- *     utils.flag(this, 'foo', 'bar'); // setter
- *     utils.flag(this, 'foo'); // getter, returns `bar`
- *
- * @param {Object} object (constructed Assertion
- * @param {String} key
- * @param {Mixed} value (optional)
- * @name flag
- * @api private
- */
-
-module.exports = function (obj, key, value) {
-  var flags = obj.__flags || (obj.__flags = Object.create(null));
-  if (arguments.length === 3) {
-    flags[key] = value;
-  } else {
-    return flags[key];
-  }
-};
-
-}); // module: chai/utils/flag.js
-
-require.register("chai/utils/getActual.js", function(module, exports, require){
-/*!
- * Chai - getActual utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-/**
- * # getActual(object, [actual])
- *
- * Returns the `actual` value for an Assertion
- *
- * @param {Object} object (constructed Assertion)
- * @param {Arguments} chai.Assertion.prototype.assert arguments
- */
-
-module.exports = function (obj, args) {
-  var actual = args[4];
-  return 'undefined' !== actual ? actual : obj.obj;
-};
-
-}); // module: chai/utils/getActual.js
-
-require.register("chai/utils/getMessage.js", function(module, exports, require){
-/*!
- * Chai - message composition utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-/*!
- * Module dependancies
- */
-
-var flag = require('./flag')
-  , getActual = require('./getActual')
-  , inspect = require('./inspect');
-
-/**
- * # getMessage(object, message, negateMessage)
- *
- * Construct the error message based on flags
- * and template tags. Template tags will return
- * a stringified inspection of the object referenced.
- *
- * Messsage template tags:
- * - `#{this}` current asserted object
- * - `#{act}` actual value
- * - `#{exp}` expected value
- *
- * @param {Object} object (constructed Assertion)
- * @param {Arguments} chai.Assertion.prototype.assert arguments
- */
-
-module.exports = function (obj, args) {
-  var negate = flag(obj, 'negate')
-    , val = flag(obj, 'object')
-    , expected = args[3]
-    , actual = getActual(obj, args)
-    , msg = negate ? args[2] : args[1]
-    , flagMsg = flag(obj, 'message');
-
-  msg = msg || '';
-  msg = msg
-    .replace(/#{this}/g, inspect(val))
-    .replace(/#{act}/g, inspect(actual))
-    .replace(/#{exp}/g, inspect(expected));
-
-  return flagMsg ? flagMsg + ': ' + msg : msg;
-};
-
-}); // module: chai/utils/getMessage.js
-
-require.register("chai/utils/getName.js", function(module, exports, require){
-/*!
- * Chai - getName utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-/**
- * # getName(func)
- *
- * Gets the name of a function, in a cross-browser way.
- *
- * @param {Function} a function (usually a constructor)
- */
-
-module.exports = function (func) {
-  if (func.name) return func.name;
-
-  var match = /^\s?function ([^(]*)\(/.exec(func);
-  return match && match[1] ? match[1] : "";
-};
-
-}); // module: chai/utils/getName.js
-
-require.register("chai/utils/getPathValue.js", function(module, exports, require){
-/*!
- * Chai - getPathValue utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * @see https://github.com/logicalparadox/filtr
- * MIT Licensed
- */
-
-/**
- * ### .getPathValue(path, object)
- *
- * This allows the retrieval of values in an
- * object given a string path.
- *
- *     var obj = {
- *         prop1: {
- *             arr: ['a', 'b', 'c']
- *           , str: 'Hello'
- *         }
- *       , prop2: {
- *             arr: [ { nested: 'Universe' } ]
- *           , str: 'Hello again!'
- *         }
- *     }
- *
- * The following would be the results.
- *
- *     getPathValue('prop1.str', obj); // Hello
- *     getPathValue('prop1.att[2]', obj); // b
- *     getPathValue('prop2.arr[0].nested', obj); // Universe
- *
- * @param {String} path
- * @param {Object} object
- * @returns {Object} value or `undefined`
- * @name getPathValue
- * @api public
- */
-
-var getPathValue = module.exports = function (path, obj) {
-  var parsed = parsePath(path);
-  return _getPathValue(parsed, obj);
-};
-
-/*!
- * ## parsePath(path)
- *
- * Helper function used to parse string object
- * paths. Use in conjunction with `_getPathValue`.
- *
- *      var parsed = parsePath('myobject.property.subprop');
- *
- * ### Paths:
- *
- * * Can be as near infinitely deep and nested
- * * Arrays are also valid using the formal `myobject.document[3].property`.
- *
- * @param {String} path
- * @returns {Object} parsed
- * @api private
- */
-
-function parsePath (path) {
-  var str = path.replace(/\[/g, '.[')
-    , parts = str.match(/(\\\.|[^.]+?)+/g);
-  return parts.map(function (value) {
-    var re = /\[(\d+)\]$/
-      , mArr = re.exec(value)
-    if (mArr) return { i: parseFloat(mArr[1]) };
-    else return { p: value };
-  });
-};
-
-/*!
- * ## _getPathValue(parsed, obj)
- *
- * Helper companion function for `.parsePath` that returns
- * the value located at the parsed address.
- *
- *      var value = getPathValue(parsed, obj);
- *
- * @param {Object} parsed definition from `parsePath`.
- * @param {Object} object to search against
- * @returns {Object|Undefined} value
- * @api private
- */
-
-function _getPathValue (parsed, obj) {
-  var tmp = obj
-    , res;
-  for (var i = 0, l = parsed.length; i < l; i++) {
-    var part = parsed[i];
-    if (tmp) {
-      if ('undefined' !== typeof part.p)
-        tmp = tmp[part.p];
-      else if ('undefined' !== typeof part.i)
-        tmp = tmp[part.i];
-      if (i == (l - 1)) res = tmp;
-    } else {
-      res = undefined;
-    }
-  }
-  return res;
-};
-
-}); // module: chai/utils/getPathValue.js
-
-require.register("chai/utils/index.js", function(module, exports, require){
-/*!
- * chai
- * Copyright(c) 2011 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
-
-/*!
- * Main exports
- */
-
-var exports = module.exports = {};
-
-/*!
- * test utility
- */
-
-exports.test = require('./test');
-
-/*!
- * message utility
- */
-
-exports.getMessage = require('./getMessage');
-
-/*!
- * actual utility
- */
-
-exports.getActual = require('./getActual');
-
-/*!
- * Inspect util
- */
-
-exports.inspect = require('./inspect');
-
-/*!
- * Flag utility
- */
-
-exports.flag = require('./flag');
-
-/*!
- * Flag transferring utility
- */
-
-exports.transferFlags = require('./transferFlags');
-
-/*!
- * Deep equal utility
- */
-
-exports.eql = require('./eql');
-
-/*!
- * Deep path value
- */
-
-exports.getPathValue = require('./getPathValue');
-
-/*!
- * Function name
- */
-
-exports.getName = require('./getName');
-
-/*!
- * add Property
- */
-
-exports.addProperty = require('./addProperty');
-
-/*!
- * add Method
- */
-
-exports.addMethod = require('./addMethod');
-
-/*!
- * overwrite Property
- */
-
-exports.overwriteProperty = require('./overwriteProperty');
-
-/*!
- * overwrite Method
- */
-
-exports.overwriteMethod = require('./overwriteMethod');
-
-/*!
- * Add a chainable method
- */
-
-exports.addChainableMethod = require('./addChainableMethod');
-
-
-}); // module: chai/utils/index.js
-
-require.register("chai/utils/inspect.js", function(module, exports, require){
-// This is (almost) directly from Node.js utils
-// https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/util.js
-
-var getName = require('./getName');
-
-module.exports = inspect;
-
-/**
- * Echos the value of a value. Trys to print the value out
- * in the best way possible given the different types.
- *
- * @param {Object} obj The object to print out.
- * @param {Boolean} showHidden Flag that shows hidden (not enumerable)
- *    properties of objects.
- * @param {Number} depth Depth in which to descend in object. Default is 2.
- * @param {Boolean} colors Flag to turn on ANSI escape codes to color the
- *    output. Default is false (no coloring).
- */
-function inspect(obj, showHidden, depth, colors) {
-  var ctx = {
-    showHidden: showHidden,
-    seen: [],
-    stylize: function (str) { return str; }
-  };
-  return formatValue(ctx, obj, (typeof depth === 'undefined' ? 2 : depth));
-}
-
-function formatValue(ctx, value, recurseTimes) {
-  // Provide a hook for user-specified inspect functions.
-  // Check that value is an object with an inspect function on it
-  if (value && typeof value.inspect === 'function' &&
-      // Filter out the util module, it's inspect function is special
-      value.inspect !== exports.inspect &&
-      // Also filter out any prototype objects using the circular check.
-      !(value.constructor && value.constructor.prototype === value)) {
-    return value.inspect(recurseTimes);
-  }
-
-  // Primitive types cannot have properties
-  var primitive = formatPrimitive(ctx, value);
-  if (primitive) {
-    return primitive;
-  }
-
-  // Look up the keys of the object.
-  var visibleKeys = Object.keys(value);
-  var keys = ctx.showHidden ? Object.getOwnPropertyNames(value) : visibleKeys;
-
-  // Some type of object without properties can be shortcutted.
-  // In IE, errors have a single `stack` property, or if they are vanilla `Error`,
-  // a `stack` plus `description` property; ignore those for consistency.
-  if (keys.length === 0 || (isError(value) && (
-      (keys.length === 1 && keys[0] === 'stack') ||
-      (keys.length === 2 && keys[0] === 'description' && keys[1] === 'stack')
-     ))) {
-    if (typeof value === 'function') {
-      var name = getName(value);
-      var nameSuffix = name ? ': ' + name : '';
-      return ctx.stylize('[Function' + nameSuffix + ']', 'special');
-    }
-    if (isRegExp(value)) {
-      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-    }
-    if (isDate(value)) {
-      return ctx.stylize(Date.prototype.toUTCString.call(value), 'date');
-    }
-    if (isError(value)) {
-      return formatError(value);
-    }
-  }
-
-  var base = '', array = false, braces = ['{', '}'];
-
-  // Make Array say that they are Array
-  if (isArray(value)) {
-    array = true;
-    braces = ['[', ']'];
-  }
-
-  // Make functions say that they are functions
-  if (typeof value === 'function') {
-    var name = getName(value);
-    var nameSuffix = name ? ': ' + name : '';
-    base = ' [Function' + nameSuffix + ']';
-  }
-
-  // Make RegExps say that they are RegExps
-  if (isRegExp(value)) {
-    base = ' ' + RegExp.prototype.toString.call(value);
-  }
-
-  // Make dates with properties first say the date
-  if (isDate(value)) {
-    base = ' ' + Date.prototype.toUTCString.call(value);
-  }
-
-  // Make error with message first say the error
-  if (isError(value)) {
-    return formatError(value);
-  }
-
-  if (keys.length === 0 && (!array || value.length == 0)) {
-    return braces[0] + base + braces[1];
-  }
-
-  if (recurseTimes < 0) {
-    if (isRegExp(value)) {
-      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-    } else {
-      return ctx.stylize('[Object]', 'special');
-    }
-  }
-
-  ctx.seen.push(value);
-
-  var output;
-  if (array) {
-    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
-  } else {
-    output = keys.map(function(key) {
-      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
-    });
-  }
-
-  ctx.seen.pop();
-
-  return reduceToSingleString(output, base, braces);
-}
-
-
-function formatPrimitive(ctx, value) {
-  switch (typeof value) {
-    case 'undefined':
-      return ctx.stylize('undefined', 'undefined');
-
-    case 'string':
-      var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
-                                               .replace(/'/g, "\\'")
-                                               .replace(/\\"/g, '"') + '\'';
-      return ctx.stylize(simple, 'string');
-
-    case 'number':
-      return ctx.stylize('' + value, 'number');
-
-    case 'boolean':
-      return ctx.stylize('' + value, 'boolean');
-  }
-  // For some reason typeof null is "object", so special case here.
-  if (value === null) {
-    return ctx.stylize('null', 'null');
-  }
-}
-
-
-function formatError(value) {
-  return '[' + Error.prototype.toString.call(value) + ']';
-}
-
-
-function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
-  var output = [];
-  for (var i = 0, l = value.length; i < l; ++i) {
-    if (Object.prototype.hasOwnProperty.call(value, String(i))) {
-      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-          String(i), true));
-    } else {
-      output.push('');
-    }
-  }
-  keys.forEach(function(key) {
-    if (!key.match(/^\d+$/)) {
-      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-          key, true));
-    }
-  });
-  return output;
-}
-
-
-function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
-  var name, str;
-  if (value.__lookupGetter__) {
-    if (value.__lookupGetter__(key)) {
-      if (value.__lookupSetter__(key)) {
-        str = ctx.stylize('[Getter/Setter]', 'special');
-      } else {
-        str = ctx.stylize('[Getter]', 'special');
-      }
-    } else {
-      if (value.__lookupSetter__(key)) {
-        str = ctx.stylize('[Setter]', 'special');
-      }
-    }
-  }
-  if (visibleKeys.indexOf(key) < 0) {
-    name = '[' + key + ']';
-  }
-  if (!str) {
-    if (ctx.seen.indexOf(value[key]) < 0) {
-      if (recurseTimes === null) {
-        str = formatValue(ctx, value[key], null);
-      } else {
-        str = formatValue(ctx, value[key], recurseTimes - 1);
-      }
-      if (str.indexOf('\n') > -1) {
-        if (array) {
-          str = str.split('\n').map(function(line) {
-            return '  ' + line;
-          }).join('\n').substr(2);
+        // Strict
+        if (!flag(this, 'negate') && !flag(this, 'contains')) {
+          ok = ok && keys.length == actual.length;
+        }
+
+        // Key string
+        if (len > 1) {
+          keys = keys.map(function(key){
+            return _.inspect(key);
+          });
+          var last = keys.pop();
+          str = keys.join(', ') + ', and ' + last;
         } else {
-          str = '\n' + str.split('\n').map(function(line) {
-            return '   ' + line;
-          }).join('\n');
+          str = _.inspect(keys[0]);
+        }
+
+        // Form
+        str = (len > 1 ? 'keys ' : 'key ') + str;
+
+        // Have / include
+        str = (flag(this, 'contains') ? 'contain ' : 'have ') + str;
+
+        // Assertion
+        this.assert(
+            ok
+          , 'expected #{this} to ' + str
+          , 'expected #{this} to not ' + str
+        );
+      }
+
+      Assertion.addMethod('keys', assertKeys);
+      Assertion.addMethod('key', assertKeys);
+
+      /**
+       * ### .throw(constructor)
+       *
+       * Asserts that the function target will throw a specific error, or specific type of error
+       * (as determined using `instanceof`), optionally with a RegExp or string inclusion test
+       * for the error's message.
+       *
+       *     var err = new ReferenceError('This is a bad function.');
+       *     var fn = function () { throw err; }
+       *     expect(fn).to.throw(ReferenceError);
+       *     expect(fn).to.throw(Error);
+       *     expect(fn).to.throw(/bad function/);
+       *     expect(fn).to.not.throw('good function');
+       *     expect(fn).to.throw(ReferenceError, /bad function/);
+       *     expect(fn).to.throw(err);
+       *     expect(fn).to.not.throw(new RangeError('Out of range.'));
+       *
+       * Please note that when a throw expectation is negated, it will check each
+       * parameter independently, starting with error constructor type. The appropriate way
+       * to check for the existence of a type of error but for a message that does not match
+       * is to use `and`.
+       *
+       *     expect(fn).to.throw(ReferenceError)
+       *        .and.not.throw(/good function/);
+       *
+       * @name throw
+       * @alias throws
+       * @alias Throw
+       * @param {ErrorConstructor} constructor
+       * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+       * @api public
+       */
+
+      function assertThrows (constructor, msg) {
+        var obj = flag(this, 'object');
+        new Assertion(obj).is.a('function');
+
+        var thrown = false
+          , desiredError = null
+          , name = null;
+
+        if (arguments.length === 0) {
+          msg = null;
+          constructor = null;
+        } else if (constructor && (constructor instanceof RegExp || 'string' === typeof constructor)) {
+          msg = constructor;
+          constructor = null;
+        } else if (constructor && constructor instanceof Error) {
+          desiredError = constructor;
+          constructor = null;
+          msg = null;
+        } else if (typeof constructor === 'function') {
+          name = (new constructor()).name;
+        } else {
+          constructor = null;
+        }
+
+        try {
+          obj();
+        } catch (err) {
+          // first, check desired error
+          if (desiredError) {
+            this.assert(
+                err === desiredError
+              , 'expected #{this} to throw ' + _.inspect(desiredError) + ' but ' + _.inspect(err) + ' was thrown'
+              , 'expected #{this} to not throw ' + _.inspect(desiredError)
+            );
+            return this;
+          }
+          // next, check constructor
+          if (constructor) {
+            this.assert(
+                err instanceof constructor
+              , 'expected #{this} to throw ' + name + ' but a ' + err.name + ' was thrown'
+              , 'expected #{this} to not throw ' + name );
+            if (!msg) return this;
+          }
+          // next, check message
+          if (err.message && msg && msg instanceof RegExp) {
+            this.assert(
+                msg.exec(err.message)
+              , 'expected #{this} to throw error matching ' + msg + ' but got ' + _.inspect(err.message)
+              , 'expected #{this} to throw error not matching ' + msg
+            );
+            return this;
+          } else if (err.message && msg && 'string' === typeof msg) {
+            this.assert(
+                ~err.message.indexOf(msg)
+              , 'expected #{this} to throw error including #{exp} but got #{act}'
+              , 'expected #{this} to throw error not including #{act}'
+              , msg
+              , err.message
+            );
+            return this;
+          } else {
+            thrown = true;
+          }
+        }
+
+        var expectedThrown = name ? name : desiredError ? _.inspect(desiredError) : 'an error';
+
+        this.assert(
+            thrown === true
+          , 'expected #{this} to throw ' + expectedThrown
+          , 'expected #{this} to not throw ' + expectedThrown
+        );
+      };
+
+      Assertion.addMethod('throw', assertThrows);
+      Assertion.addMethod('throws', assertThrows);
+      Assertion.addMethod('Throw', assertThrows);
+
+      /**
+       * ### .respondTo(method)
+       *
+       * Asserts that the object or class target will respond to a method.
+       *
+       *     Klass.prototype.bar = function(){};
+       *     expect(Klass).to.respondTo('bar');
+       *     expect(obj).to.respondTo('bar');
+       *
+       * To check if a constructor will respond to a static function,
+       * set the `itself` flag.
+       *
+       *    Klass.baz = function(){};
+       *    expect(Klass).itself.to.respondTo('baz');
+       *
+       * @name respondTo
+       * @param {String} method
+       * @api public
+       */
+
+      Assertion.addMethod('respondTo', function (method) {
+        var obj = flag(this, 'object')
+          , itself = flag(this, 'itself')
+          , context = ('function' === typeof obj && !itself)
+            ? obj.prototype[method]
+            : obj[method];
+
+        this.assert(
+            'function' === typeof context
+          , 'expected #{this} to respond to ' + _.inspect(method)
+          , 'expected #{this} to not respond to ' + _.inspect(method)
+        );
+      });
+
+      /**
+       * ### .itself
+       *
+       * Sets the `itself` flag, later used by the `respondTo` assertion.
+       *
+       *    function Foo() {}
+       *    Foo.bar = function() {}
+       *    Foo.prototype.baz = function() {}
+       *
+       *    expect(Foo).itself.to.respondTo('bar');
+       *    expect(Foo).itself.not.to.respondTo('baz');
+       *
+       * @name itself
+       * @api public
+       */
+
+      Assertion.addProperty('itself', function () {
+        flag(this, 'itself', true);
+      });
+
+      /**
+       * ### .satisfy(method)
+       *
+       * Asserts that the target passes a given truth test.
+       *
+       *     expect(1).to.satisfy(function(num) { return num > 0; });
+       *
+       * @name satisfy
+       * @param {Function} matcher
+       * @api public
+       */
+
+      Assertion.addMethod('satisfy', function (matcher) {
+        var obj = flag(this, 'object');
+        this.assert(
+            matcher(obj)
+          , 'expected #{this} to satisfy ' + _.inspect(matcher)
+          , 'expected #{this} to not satisfy' + _.inspect(matcher)
+          , this.negate ? false : true
+          , matcher(obj)
+        );
+      });
+
+      /**
+       * ### .closeTo(expected, delta)
+       *
+       * Asserts that the target is equal `expected`, to within a +/- `delta` range.
+       *
+       *     expect(1.5).to.be.closeTo(1, 0.5);
+       *
+       * @name closeTo
+       * @param {Number} expected
+       * @param {Number} delta
+       * @api public
+       */
+
+      Assertion.addMethod('closeTo', function (expected, delta) {
+        var obj = flag(this, 'object');
+        this.assert(
+            Math.abs(obj - expected) <= delta
+          , 'expected #{this} to be close to ' + expected + ' +/- ' + delta
+          , 'expected #{this} not to be close to ' + expected + ' +/- ' + delta
+        );
+      });
+
+    };
+
+  }); // module: chai/core/assertions.js
+
+  require.register("chai/interface/assert.js", function(module, exports, require){
+    /*!
+     * chai
+     * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+
+    module.exports = function (chai, util) {
+
+      /*!
+       * Chai dependencies.
+       */
+
+      var Assertion = chai.Assertion
+        , flag = util.flag;
+
+      /*!
+       * Module export.
+       */
+
+      /**
+       * ### assert(expression, message)
+       *
+       * Write your own test expressions.
+       *
+       *     assert('foo' !== 'bar', 'foo is not bar');
+       *     assert(Array.isArray([]), 'empty arrays are arrays');
+       *
+       * @param {Mixed} expression to test for truthiness
+       * @param {String} message to display on error
+       * @name assert
+       * @api public
+       */
+
+      var assert = chai.assert = function (express, errmsg) {
+        var test = new Assertion(null);
+        test.assert(
+            express
+          , errmsg
+          , '[ negation message unavailable ]'
+        );
+      };
+
+      /**
+       * ### .fail(actual, expected, [message], [operator])
+       *
+       * Throw a failure. Node.js `assert` module-compatible.
+       *
+       * @name fail
+       * @param {Mixed} actual
+       * @param {Mixed} expected
+       * @param {String} message
+       * @param {String} operator
+       * @api public
+       */
+
+      assert.fail = function (actual, expected, message, operator) {
+        throw new chai.AssertionError({
+            actual: actual
+          , expected: expected
+          , message: message
+          , operator: operator
+          , stackStartFunction: assert.fail
+        });
+      };
+
+      /**
+       * ### .ok(object, [message])
+       *
+       * Asserts that `object` is truthy.
+       *
+       *     assert.ok('everything', 'everything is ok');
+       *     assert.ok(false, 'this will fail');
+       *
+       * @name ok
+       * @param {Mixed} object to test
+       * @param {String} message
+       * @api public
+       */
+
+      assert.ok = function (val, msg) {
+        new Assertion(val, msg).is.ok;
+      };
+
+      /**
+       * ### .equal(actual, expected, [message])
+       *
+       * Asserts non-strict equality (`==`) of `actual` and `expected`.
+       *
+       *     assert.equal(3, '3', '== coerces values to strings');
+       *
+       * @name equal
+       * @param {Mixed} actual
+       * @param {Mixed} expected
+       * @param {String} message
+       * @api public
+       */
+
+      assert.equal = function (act, exp, msg) {
+        var test = new Assertion(act, msg);
+
+        test.assert(
+            exp == flag(test, 'object')
+          , 'expected #{this} to equal #{exp}'
+          , 'expected #{this} to not equal #{act}'
+          , exp
+          , act
+        );
+      };
+
+      /**
+       * ### .notEqual(actual, expected, [message])
+       *
+       * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
+       *
+       *     assert.notEqual(3, 4, 'these numbers are not equal');
+       *
+       * @name notEqual
+       * @param {Mixed} actual
+       * @param {Mixed} expected
+       * @param {String} message
+       * @api public
+       */
+
+      assert.notEqual = function (act, exp, msg) {
+        var test = new Assertion(act, msg);
+
+        test.assert(
+            exp != flag(test, 'object')
+          , 'expected #{this} to not equal #{exp}'
+          , 'expected #{this} to equal #{act}'
+          , exp
+          , act
+        );
+      };
+
+      /**
+       * ### .strictEqual(actual, expected, [message])
+       *
+       * Asserts strict equality (`===`) of `actual` and `expected`.
+       *
+       *     assert.strictEqual(true, true, 'these booleans are strictly equal');
+       *
+       * @name strictEqual
+       * @param {Mixed} actual
+       * @param {Mixed} expected
+       * @param {String} message
+       * @api public
+       */
+
+      assert.strictEqual = function (act, exp, msg) {
+        new Assertion(act, msg).to.equal(exp);
+      };
+
+      /**
+       * ### .notStrictEqual(actual, expected, [message])
+       *
+       * Asserts strict inequality (`!==`) of `actual` and `expected`.
+       *
+       *     assert.notStrictEqual(3, '3', 'no coercion for strict equality');
+       *
+       * @name notStrictEqual
+       * @param {Mixed} actual
+       * @param {Mixed} expected
+       * @param {String} message
+       * @api public
+       */
+
+      assert.notStrictEqual = function (act, exp, msg) {
+        new Assertion(act, msg).to.not.equal(exp);
+      };
+
+      /**
+       * ### .deepEqual(actual, expected, [message])
+       *
+       * Asserts that `actual` is deeply equal to `expected`.
+       *
+       *     assert.deepEqual({ tea: 'green' }, { tea: 'green' });
+       *
+       * @name deepEqual
+       * @param {Mixed} actual
+       * @param {Mixed} expected
+       * @param {String} message
+       * @api public
+       */
+
+      assert.deepEqual = function (act, exp, msg) {
+        new Assertion(act, msg).to.eql(exp);
+      };
+
+      /**
+       * ### .notDeepEqual(actual, expected, [message])
+       *
+       * Assert that `actual` is not deeply equal to `expected`.
+       *
+       *     assert.notDeepEqual({ tea: 'green' }, { tea: 'jasmine' });
+       *
+       * @name notDeepEqual
+       * @param {Mixed} actual
+       * @param {Mixed} expected
+       * @param {String} message
+       * @api public
+       */
+
+      assert.notDeepEqual = function (act, exp, msg) {
+        new Assertion(act, msg).to.not.eql(exp);
+      };
+
+      /**
+       * ### .isTrue(value, [message])
+       *
+       * Asserts that `value` is true.
+       *
+       *     var teaServed = true;
+       *     assert.isTrue(teaServed, 'the tea has been served');
+       *
+       * @name isTrue
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isTrue = function (val, msg) {
+        new Assertion(val, msg).is['true'];
+      };
+
+      /**
+       * ### .isFalse(value, [message])
+       *
+       * Asserts that `value` is false.
+       *
+       *     var teaServed = false;
+       *     assert.isFalse(teaServed, 'no tea yet? hmm...');
+       *
+       * @name isFalse
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isFalse = function (val, msg) {
+        new Assertion(val, msg).is['false'];
+      };
+
+      /**
+       * ### .isNull(value, [message])
+       *
+       * Asserts that `value` is null.
+       *
+       *     assert.isNull(err, 'there was no error');
+       *
+       * @name isNull
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isNull = function (val, msg) {
+        new Assertion(val, msg).to.equal(null);
+      };
+
+      /**
+       * ### .isNotNull(value, [message])
+       *
+       * Asserts that `value` is not null.
+       *
+       *     var tea = 'tasty chai';
+       *     assert.isNotNull(tea, 'great, time for tea!');
+       *
+       * @name isNotNull
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isNotNull = function (val, msg) {
+        new Assertion(val, msg).to.not.equal(null);
+      };
+
+      /**
+       * ### .isUndefined(value, [message])
+       *
+       * Asserts that `value` is `undefined`.
+       *
+       *     var tea;
+       *     assert.isUndefined(tea, 'no tea defined');
+       *
+       * @name isUndefined
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isUndefined = function (val, msg) {
+        new Assertion(val, msg).to.equal(undefined);
+      };
+
+      /**
+       * ### .isDefined(value, [message])
+       *
+       * Asserts that `value` is not `undefined`.
+       *
+       *     var tea = 'cup of chai';
+       *     assert.isDefined(tea, 'tea has been defined');
+       *
+       * @name isUndefined
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isDefined = function (val, msg) {
+        new Assertion(val, msg).to.not.equal(undefined);
+      };
+
+      /**
+       * ### .isFunction(value, [message])
+       *
+       * Asserts that `value` is a function.
+       *
+       *     function serveTea() { return 'cup of tea'; };
+       *     assert.isFunction(serveTea, 'great, we can have tea now');
+       *
+       * @name isFunction
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isFunction = function (val, msg) {
+        new Assertion(val, msg).to.be.a('function');
+      };
+
+      /**
+       * ### .isNotFunction(value, [message])
+       *
+       * Asserts that `value` is _not_ a function.
+       *
+       *     var serveTea = [ 'heat', 'pour', 'sip' ];
+       *     assert.isNotFunction(serveTea, 'great, we have listed the steps');
+       *
+       * @name isNotFunction
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isNotFunction = function (val, msg) {
+        new Assertion(val, msg).to.not.be.a('function');
+      };
+
+      /**
+       * ### .isObject(value, [message])
+       *
+       * Asserts that `value` is an object (as revealed by
+       * `Object.prototype.toString`).
+       *
+       *     var selection = { name: 'Chai', serve: 'with spices' };
+       *     assert.isObject(selection, 'tea selection is an object');
+       *
+       * @name isObject
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isObject = function (val, msg) {
+        new Assertion(val, msg).to.be.a('object');
+      };
+
+      /**
+       * ### .isNotObject(value, [message])
+       *
+       * Asserts that `value` is _not_ an object.
+       *
+       *     var selection = 'chai'
+       *     assert.isObject(selection, 'tea selection is not an object');
+       *     assert.isObject(null, 'null is not an object');
+       *
+       * @name isNotObject
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isNotObject = function (val, msg) {
+        new Assertion(val, msg).to.not.be.a('object');
+      };
+
+      /**
+       * ### .isArray(value, [message])
+       *
+       * Asserts that `value` is an array.
+       *
+       *     var menu = [ 'green', 'chai', 'oolong' ];
+       *     assert.isArray(menu, 'what kind of tea do we want?');
+       *
+       * @name isArray
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isArray = function (val, msg) {
+        new Assertion(val, msg).to.be.an('array');
+      };
+
+      /**
+       * ### .isNotArray(value, [message])
+       *
+       * Asserts that `value` is _not_ an array.
+       *
+       *     var menu = 'green|chai|oolong';
+       *     assert.isNotArray(menu, 'what kind of tea do we want?');
+       *
+       * @name isNotArray
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isNotArray = function (val, msg) {
+        new Assertion(val, msg).to.not.be.an('array');
+      };
+
+      /**
+       * ### .isString(value, [message])
+       *
+       * Asserts that `value` is a string.
+       *
+       *     var teaOrder = 'chai';
+       *     assert.isString(teaOrder, 'order placed');
+       *
+       * @name isString
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isString = function (val, msg) {
+        new Assertion(val, msg).to.be.a('string');
+      };
+
+      /**
+       * ### .isNotString(value, [message])
+       *
+       * Asserts that `value` is _not_ a string.
+       *
+       *     var teaOrder = 4;
+       *     assert.isNotString(teaOrder, 'order placed');
+       *
+       * @name isNotString
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isNotString = function (val, msg) {
+        new Assertion(val, msg).to.not.be.a('string');
+      };
+
+      /**
+       * ### .isNumber(value, [message])
+       *
+       * Asserts that `value` is a number.
+       *
+       *     var cups = 2;
+       *     assert.isNumber(cups, 'how many cups');
+       *
+       * @name isNumber
+       * @param {Number} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isNumber = function (val, msg) {
+        new Assertion(val, msg).to.be.a('number');
+      };
+
+      /**
+       * ### .isNotNumber(value, [message])
+       *
+       * Asserts that `value` is _not_ a number.
+       *
+       *     var cups = '2 cups please';
+       *     assert.isNotNumber(cups, 'how many cups');
+       *
+       * @name isNotNumber
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isNotNumber = function (val, msg) {
+        new Assertion(val, msg).to.not.be.a('number');
+      };
+
+      /**
+       * ### .isBoolean(value, [message])
+       *
+       * Asserts that `value` is a boolean.
+       *
+       *     var teaReady = true
+       *       , teaServed = false;
+       *
+       *     assert.isBoolean(teaReady, 'is the tea ready');
+       *     assert.isBoolean(teaServed, 'has tea been served');
+       *
+       * @name isBoolean
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isBoolean = function (val, msg) {
+        new Assertion(val, msg).to.be.a('boolean');
+      };
+
+      /**
+       * ### .isNotBoolean(value, [message])
+       *
+       * Asserts that `value` is _not_ a boolean.
+       *
+       *     var teaReady = 'yep'
+       *       , teaServed = 'nope';
+       *
+       *     assert.isNotBoolean(teaReady, 'is the tea ready');
+       *     assert.isNotBoolean(teaServed, 'has tea been served');
+       *
+       * @name isNotBoolean
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.isNotBoolean = function (val, msg) {
+        new Assertion(val, msg).to.not.be.a('boolean');
+      };
+
+      /**
+       * ### .typeOf(value, name, [message])
+       *
+       * Asserts that `value`'s type is `name`, as determined by
+       * `Object.prototype.toString`.
+       *
+       *     assert.typeOf({ tea: 'chai' }, 'object', 'we have an object');
+       *     assert.typeOf(['chai', 'jasmine'], 'array', 'we have an array');
+       *     assert.typeOf('tea', 'string', 'we have a string');
+       *     assert.typeOf(/tea/, 'regexp', 'we have a regular expression');
+       *     assert.typeOf(null, 'null', 'we have a null');
+       *     assert.typeOf(undefined, 'undefined', 'we have an undefined');
+       *
+       * @name typeOf
+       * @param {Mixed} value
+       * @param {String} name
+       * @param {String} message
+       * @api public
+       */
+
+      assert.typeOf = function (val, type, msg) {
+        new Assertion(val, msg).to.be.a(type);
+      };
+
+      /**
+       * ### .notTypeOf(value, name, [message])
+       *
+       * Asserts that `value`'s type is _not_ `name`, as determined by
+       * `Object.prototype.toString`.
+       *
+       *     assert.notTypeOf('tea', 'number', 'strings are not numbers');
+       *
+       * @name notTypeOf
+       * @param {Mixed} value
+       * @param {String} typeof name
+       * @param {String} message
+       * @api public
+       */
+
+      assert.notTypeOf = function (val, type, msg) {
+        new Assertion(val, msg).to.not.be.a(type);
+      };
+
+      /**
+       * ### .instanceOf(object, constructor, [message])
+       *
+       * Asserts that `value` is an instance of `constructor`.
+       *
+       *     var Tea = function (name) { this.name = name; }
+       *       , chai = new Tea('chai');
+       *
+       *     assert.instanceOf(chai, Tea, 'chai is an instance of tea');
+       *
+       * @name instanceOf
+       * @param {Object} object
+       * @param {Constructor} constructor
+       * @param {String} message
+       * @api public
+       */
+
+      assert.instanceOf = function (val, type, msg) {
+        new Assertion(val, msg).to.be.instanceOf(type);
+      };
+
+      /**
+       * ### .notInstanceOf(object, constructor, [message])
+       *
+       * Asserts `value` is not an instance of `constructor`.
+       *
+       *     var Tea = function (name) { this.name = name; }
+       *       , chai = new String('chai');
+       *
+       *     assert.notInstanceOf(chai, Tea, 'chai is not an instance of tea');
+       *
+       * @name notInstanceOf
+       * @param {Object} object
+       * @param {Constructor} constructor
+       * @param {String} message
+       * @api public
+       */
+
+      assert.notInstanceOf = function (val, type, msg) {
+        new Assertion(val, msg).to.not.be.instanceOf(type);
+      };
+
+      /**
+       * ### .include(haystack, needle, [message])
+       *
+       * Asserts that `haystack` includes `needle`. Works
+       * for strings and arrays.
+       *
+       *     assert.include('foobar', 'bar', 'foobar contains string "bar"');
+       *     assert.include([ 1, 2, 3 ], 3, 'array contains value');
+       *
+       * @name include
+       * @param {Array|String} haystack
+       * @param {Mixed} needle
+       * @param {String} message
+       * @api public
+       */
+
+      assert.include = function (exp, inc, msg) {
+        var obj = new Assertion(exp, msg);
+
+        if (Array.isArray(exp)) {
+          obj.to.include(inc);
+        } else if ('string' === typeof exp) {
+          obj.to.contain.string(inc);
+        }
+      };
+
+      /**
+       * ### .match(value, regexp, [message])
+       *
+       * Asserts that `value` matches the regular expression `regexp`.
+       *
+       *     assert.match('foobar', /^foo/, 'regexp matches');
+       *
+       * @name match
+       * @param {Mixed} value
+       * @param {RegExp} regexp
+       * @param {String} message
+       * @api public
+       */
+
+      assert.match = function (exp, re, msg) {
+        new Assertion(exp, msg).to.match(re);
+      };
+
+      /**
+       * ### .notMatch(value, regexp, [message])
+       *
+       * Asserts that `value` does not match the regular expression `regexp`.
+       *
+       *     assert.notMatch('foobar', /^foo/, 'regexp does not match');
+       *
+       * @name notMatch
+       * @param {Mixed} value
+       * @param {RegExp} regexp
+       * @param {String} message
+       * @api public
+       */
+
+      assert.notMatch = function (exp, re, msg) {
+        new Assertion(exp, msg).to.not.match(re);
+      };
+
+      /**
+       * ### .property(object, property, [message])
+       *
+       * Asserts that `object` has a property named by `property`.
+       *
+       *     assert.property({ tea: { green: 'matcha' }}, 'tea');
+       *
+       * @name property
+       * @param {Object} object
+       * @param {String} property
+       * @param {String} message
+       * @api public
+       */
+
+      assert.property = function (obj, prop, msg) {
+        new Assertion(obj, msg).to.have.property(prop);
+      };
+
+      /**
+       * ### .notProperty(object, property, [message])
+       *
+       * Asserts that `object` does _not_ have a property named by `property`.
+       *
+       *     assert.notProperty({ tea: { green: 'matcha' }}, 'coffee');
+       *
+       * @name notProperty
+       * @param {Object} object
+       * @param {String} property
+       * @param {String} message
+       * @api public
+       */
+
+      assert.notProperty = function (obj, prop, msg) {
+        new Assertion(obj, msg).to.not.have.property(prop);
+      };
+
+      /**
+       * ### .deepProperty(object, property, [message])
+       *
+       * Asserts that `object` has a property named by `property`, which can be a
+       * string using dot- and bracket-notation for deep reference.
+       *
+       *     assert.deepProperty({ tea: { green: 'matcha' }}, 'tea.green');
+       *
+       * @name deepProperty
+       * @param {Object} object
+       * @param {String} property
+       * @param {String} message
+       * @api public
+       */
+
+      assert.deepProperty = function (obj, prop, msg) {
+        new Assertion(obj, msg).to.have.deep.property(prop);
+      };
+
+      /**
+       * ### .notDeepProperty(object, property, [message])
+       *
+       * Asserts that `object` does _not_ have a property named by `property`, which
+       * can be a string using dot- and bracket-notation for deep reference.
+       *
+       *     assert.notDeepProperty({ tea: { green: 'matcha' }}, 'tea.oolong');
+       *
+       * @name notDeepProperty
+       * @param {Object} object
+       * @param {String} property
+       * @param {String} message
+       * @api public
+       */
+
+      assert.notDeepProperty = function (obj, prop, msg) {
+        new Assertion(obj, msg).to.not.have.deep.property(prop);
+      };
+
+      /**
+       * ### .propertyVal(object, property, value, [message])
+       *
+       * Asserts that `object` has a property named by `property` with value given
+       * by `value`.
+       *
+       *     assert.propertyVal({ tea: 'is good' }, 'tea', 'is good');
+       *
+       * @name propertyVal
+       * @param {Object} object
+       * @param {String} property
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.propertyVal = function (obj, prop, val, msg) {
+        new Assertion(obj, msg).to.have.property(prop, val);
+      };
+
+      /**
+       * ### .propertyNotVal(object, property, value, [message])
+       *
+       * Asserts that `object` has a property named by `property`, but with a value
+       * different from that given by `value`.
+       *
+       *     assert.propertyNotVal({ tea: 'is good' }, 'tea', 'is bad');
+       *
+       * @name propertyNotVal
+       * @param {Object} object
+       * @param {String} property
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.propertyNotVal = function (obj, prop, val, msg) {
+        new Assertion(obj, msg).to.not.have.property(prop, val);
+      };
+
+      /**
+       * ### .deepPropertyVal(object, property, value, [message])
+       *
+       * Asserts that `object` has a property named by `property` with value given
+       * by `value`. `property` can use dot- and bracket-notation for deep
+       * reference.
+       *
+       *     assert.deepPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'matcha');
+       *
+       * @name deepPropertyVal
+       * @param {Object} object
+       * @param {String} property
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.deepPropertyVal = function (obj, prop, val, msg) {
+        new Assertion(obj, msg).to.have.deep.property(prop, val);
+      };
+
+      /**
+       * ### .deepPropertyNotVal(object, property, value, [message])
+       *
+       * Asserts that `object` has a property named by `property`, but with a value
+       * different from that given by `value`. `property` can use dot- and
+       * bracket-notation for deep reference.
+       *
+       *     assert.deepPropertyNotVal({ tea: { green: 'matcha' }}, 'tea.green', 'konacha');
+       *
+       * @name deepPropertyNotVal
+       * @param {Object} object
+       * @param {String} property
+       * @param {Mixed} value
+       * @param {String} message
+       * @api public
+       */
+
+      assert.deepPropertyNotVal = function (obj, prop, val, msg) {
+        new Assertion(obj, msg).to.not.have.deep.property(prop, val);
+      };
+
+      /**
+       * ### .lengthOf(object, length, [message])
+       *
+       * Asserts that `object` has a `length` property with the expected value.
+       *
+       *     assert.lengthOf([1,2,3], 3, 'array has length of 3');
+       *     assert.lengthOf('foobar', 5, 'string has length of 6');
+       *
+       * @name lengthOf
+       * @param {Mixed} object
+       * @param {Number} length
+       * @param {String} message
+       * @api public
+       */
+
+      assert.lengthOf = function (exp, len, msg) {
+        new Assertion(exp, msg).to.have.length(len);
+      };
+
+      /**
+       * ### .throws(function, [constructor/regexp], [message])
+       *
+       * Asserts that `function` will throw an error that is an instance of
+       * `constructor`, or alternately that it will throw an error with message
+       * matching `regexp`.
+       *
+       *     assert.throw(fn, ReferenceError, 'function throws a reference error');
+       *
+       * @name throws
+       * @alias throw
+       * @alias Throw
+       * @param {Function} function
+       * @param {ErrorConstructor} constructor
+       * @param {RegExp} regexp
+       * @param {String} message
+       * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+       * @api public
+       */
+
+      assert.Throw = function (fn, type, msg) {
+        if ('string' === typeof type) {
+          msg = type;
+          type = null;
+        }
+
+        new Assertion(fn, msg).to.Throw(type);
+      };
+
+      /**
+       * ### .doesNotThrow(function, [constructor/regexp], [message])
+       *
+       * Asserts that `function` will _not_ throw an error that is an instance of
+       * `constructor`, or alternately that it will not throw an error with message
+       * matching `regexp`.
+       *
+       *     assert.doesNotThrow(fn, Error, 'function does not throw');
+       *
+       * @name doesNotThrow
+       * @param {Function} function
+       * @param {ErrorConstructor} constructor
+       * @param {RegExp} regexp
+       * @param {String} message
+       * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+       * @api public
+       */
+
+      assert.doesNotThrow = function (fn, type, msg) {
+        if ('string' === typeof type) {
+          msg = type;
+          type = null;
+        }
+
+        new Assertion(fn, msg).to.not.Throw(type);
+      };
+
+      /**
+       * ### .operator(val1, operator, val2, [message])
+       *
+       * Compares two values using `operator`.
+       *
+       *     assert.operator(1, '<', 2, 'everything is ok');
+       *     assert.operator(1, '>', 2, 'this will fail');
+       *
+       * @name operator
+       * @param {Mixed} val1
+       * @param {String} operator
+       * @param {Mixed} val2
+       * @param {String} message
+       * @api public
+       */
+
+      assert.operator = function (val, operator, val2, msg) {
+        if (!~['==', '===', '>', '>=', '<', '<=', '!=', '!=='].indexOf(operator)) {
+          throw new Error('Invalid operator "' + operator + '"');
+        }
+        var test = new Assertion(eval(val + operator + val2), msg);
+        test.assert(
+            true === flag(test, 'object')
+          , 'expected ' + util.inspect(val) + ' to be ' + operator + ' ' + util.inspect(val2)
+          , 'expected ' + util.inspect(val) + ' to not be ' + operator + ' ' + util.inspect(val2) );
+      };
+
+      /*!
+       * Undocumented / untested
+       */
+
+      assert.ifError = function (val, msg) {
+        new Assertion(val, msg).to.not.be.ok;
+      };
+
+      /*!
+       * Aliases.
+       */
+
+      (function alias(name, as){
+        assert[as] = assert[name];
+        return alias;
+      })
+      ('Throw', 'throw')
+      ('Throw', 'throws');
+    };
+
+  }); // module: chai/interface/assert.js
+
+  require.register("chai/interface/expect.js", function(module, exports, require){
+    /*!
+     * chai
+     * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+    module.exports = function (chai, util) {
+      chai.expect = function (val, message) {
+        return new chai.Assertion(val, message);
+      };
+    };
+
+
+  }); // module: chai/interface/expect.js
+
+  require.register("chai/interface/should.js", function(module, exports, require){
+    /*!
+     * chai
+     * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+    module.exports = function (chai, util) {
+      var Assertion = chai.Assertion;
+
+      function loadShould () {
+        // modify Object.prototype to have `should`
+        Object.defineProperty(Object.prototype, 'should',
+          { set: function () {}
+          , get: function(){
+              if (this instanceof String || this instanceof Number) {
+                return new Assertion(this.constructor(this));
+              } else if (this instanceof Boolean) {
+                return new Assertion(this == true);
+              }
+              return new Assertion(this);
+            }
+          , configurable: true
+        });
+
+        var should = {};
+
+        should.equal = function (val1, val2) {
+          new Assertion(val1).to.equal(val2);
+        };
+
+        should.Throw = function (fn, errt, errs) {
+          new Assertion(fn).to.Throw(errt, errs);
+        };
+
+        should.exist = function (val) {
+          new Assertion(val).to.exist;
+        }
+
+        // negation
+        should.not = {}
+
+        should.not.equal = function (val1, val2) {
+          new Assertion(val1).to.not.equal(val2);
+        };
+
+        should.not.Throw = function (fn, errt, errs) {
+          new Assertion(fn).to.not.Throw(errt, errs);
+        };
+
+        should.not.exist = function (val) {
+          new Assertion(val).to.not.exist;
+        }
+
+        should['throw'] = should['Throw'];
+        should.not['throw'] = should.not['Throw'];
+
+        return should;
+      };
+
+      chai.should = loadShould;
+      chai.Should = loadShould;
+    };
+
+  }); // module: chai/interface/should.js
+
+  require.register("chai/utils/addChainableMethod.js", function(module, exports, require){
+    /*!
+     * Chai - addChainingMethod utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+    /*!
+     * Module dependencies
+     */
+
+    var transferFlags = require('./transferFlags');
+
+    /**
+     * ### addChainableMethod (ctx, name, method, chainingBehavior)
+     *
+     * Adds a method to an object, such that the method can also be chained.
+     *
+     *     utils.addChainableMethod(chai.Assertion.prototype, 'foo', function (str) {
+     *       var obj = utils.flag(this, 'object');
+     *       new chai.Assertion(obj).to.be.equal(str);
+     *     });
+     *
+     * Can also be accessed directly from `chai.Assertion`.
+     *
+     *     chai.Assertion.addChainableMethod('foo', fn, chainingBehavior);
+     *
+     * The result can then be used as both a method assertion, executing both `method` and
+     * `chainingBehavior`, or as a language chain, which only executes `chainingBehavior`.
+     *
+     *     expect(fooStr).to.be.foo('bar');
+     *     expect(fooStr).to.be.foo.equal('foo');
+     *
+     * @param {Object} ctx object to which the method is added
+     * @param {String} name of method to add
+     * @param {Function} method function to be used for `name`, when called
+     * @param {Function} chainingBehavior function to be called every time the property is accessed
+     * @name addChainableMethod
+     * @api public
+     */
+
+    module.exports = function (ctx, name, method, chainingBehavior) {
+      if (typeof chainingBehavior !== 'function')
+        chainingBehavior = function () { };
+
+      Object.defineProperty(ctx, name,
+        { get: function () {
+            chainingBehavior.call(this);
+
+            var assert = function () {
+              var result = method.apply(this, arguments);
+              return result === undefined ? this : result;
+            };
+
+            // Re-enumerate every time to better accomodate plugins.
+            var asserterNames = Object.getOwnPropertyNames(ctx);
+            asserterNames.forEach(function (asserterName) {
+              var pd = Object.getOwnPropertyDescriptor(ctx, asserterName)
+                , functionProtoPD = Object.getOwnPropertyDescriptor(Function.prototype, asserterName);
+              // Avoid trying to overwrite things that we can't, like `length` and `arguments`.
+              if (functionProtoPD && !functionProtoPD.configurable) return;
+              if (asserterName === 'arguments') return; // @see chaijs/chai/issues/69
+              Object.defineProperty(assert, asserterName, pd);
+            });
+
+            transferFlags(this, assert);
+            return assert;
+          }
+        , configurable: true
+      });
+    };
+
+  }); // module: chai/utils/addChainableMethod.js
+
+  require.register("chai/utils/addMethod.js", function(module, exports, require){
+    /*!
+     * Chai - addMethod utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+    /**
+     * ### addMethod (ctx, name, method)
+     *
+     * Adds a method to the prototype of an object.
+     *
+     *     utils.addMethod(chai.Assertion.prototype, 'foo', function (str) {
+     *       var obj = utils.flag(this, 'object');
+     *       new chai.Assertion(obj).to.be.equal(str);
+     *     });
+     *
+     * Can also be accessed directly from `chai.Assertion`.
+     *
+     *     chai.Assertion.addMethod('foo', fn);
+     *
+     * Then can be used as any other assertion.
+     *
+     *     expect(fooStr).to.be.foo('bar');
+     *
+     * @param {Object} ctx object to which the method is added
+     * @param {String} name of method to add
+     * @param {Function} method function to be used for name
+     * @name addMethod
+     * @api public
+     */
+
+    module.exports = function (ctx, name, method) {
+      ctx[name] = function () {
+        var result = method.apply(this, arguments);
+        return result === undefined ? this : result;
+      };
+    };
+
+  }); // module: chai/utils/addMethod.js
+
+  require.register("chai/utils/addProperty.js", function(module, exports, require){
+    /*!
+     * Chai - addProperty utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+    /**
+     * ### addProperty (ctx, name, getter)
+     *
+     * Adds a property to the prototype of an object.
+     *
+     *     utils.addProperty(chai.Assertion.prototype, 'foo', function () {
+     *       var obj = utils.flag(this, 'object');
+     *       new chai.Assertion(obj).to.be.instanceof(Foo);
+     *     });
+     *
+     * Can also be accessed directly from `chai.Assertion`.
+     *
+     *     chai.Assertion.addProperty('foo', fn);
+     *
+     * Then can be used as any other assertion.
+     *
+     *     expect(myFoo).to.be.foo;
+     *
+     * @param {Object} ctx object to which the property is added
+     * @param {String} name of property to add
+     * @param {Function} getter function to be used for name
+     * @name addProperty
+     * @api public
+     */
+
+    module.exports = function (ctx, name, getter) {
+      Object.defineProperty(ctx, name,
+        { get: function () {
+            var result = getter.call(this);
+            return result === undefined ? this : result;
+          }
+        , configurable: true
+      });
+    };
+
+  }); // module: chai/utils/addProperty.js
+
+  require.register("chai/utils/eql.js", function(module, exports, require){
+    // This is directly from Node.js assert
+    // https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/assert.js
+
+
+    module.exports = _deepEqual;
+
+    // For browser implementation
+    if (!Buffer) {
+      var Buffer = {
+        isBuffer: function () {
+          return false;
+        }
+      };
+    }
+
+    function _deepEqual(actual, expected) {
+      // 7.1. All identical values are equivalent, as determined by ===.
+      if (actual === expected) {
+        return true;
+
+      } else if (Buffer.isBuffer(actual) && Buffer.isBuffer(expected)) {
+        if (actual.length != expected.length) return false;
+
+        for (var i = 0; i < actual.length; i++) {
+          if (actual[i] !== expected[i]) return false;
+        }
+
+        return true;
+
+      // 7.2. If the expected value is a Date object, the actual value is
+      // equivalent if it is also a Date object that refers to the same time.
+      } else if (actual instanceof Date && expected instanceof Date) {
+        return actual.getTime() === expected.getTime();
+
+      // 7.3. Other pairs that do not both pass typeof value == 'object',
+      // equivalence is determined by ==.
+      } else if (typeof actual != 'object' && typeof expected != 'object') {
+        return actual === expected;
+
+      // 7.4. For all other Object pairs, including Array objects, equivalence is
+      // determined by having the same number of owned properties (as verified
+      // with Object.prototype.hasOwnProperty.call), the same set of keys
+      // (although not necessarily the same order), equivalent values for every
+      // corresponding key, and an identical 'prototype' property. Note: this
+      // accounts for both named and indexed properties on Arrays.
+      } else {
+        return objEquiv(actual, expected);
+      }
+    }
+
+    function isUndefinedOrNull(value) {
+      return value === null || value === undefined;
+    }
+
+    function isArguments(object) {
+      return Object.prototype.toString.call(object) == '[object Arguments]';
+    }
+
+    function objEquiv(a, b) {
+      if (isUndefinedOrNull(a) || isUndefinedOrNull(b))
+        return false;
+      // an identical 'prototype' property.
+      if (a.prototype !== b.prototype) return false;
+      //~~~I've managed to break Object.keys through screwy arguments passing.
+      //   Converting to array solves the problem.
+      if (isArguments(a)) {
+        if (!isArguments(b)) {
+          return false;
+        }
+        a = pSlice.call(a);
+        b = pSlice.call(b);
+        return _deepEqual(a, b);
+      }
+      try {
+        var ka = Object.keys(a),
+            kb = Object.keys(b),
+            key, i;
+      } catch (e) {//happens when one is a string literal and the other isn't
+        return false;
+      }
+      // having the same number of owned properties (keys incorporates
+      // hasOwnProperty)
+      if (ka.length != kb.length)
+        return false;
+      //the same set of keys (although not necessarily the same order),
+      ka.sort();
+      kb.sort();
+      //~~~cheap key test
+      for (i = ka.length - 1; i >= 0; i--) {
+        if (ka[i] != kb[i])
+          return false;
+      }
+      //equivalent values for every corresponding key, and
+      //~~~possibly expensive deep test
+      for (i = ka.length - 1; i >= 0; i--) {
+        key = ka[i];
+        if (!_deepEqual(a[key], b[key])) return false;
+      }
+      return true;
+    }
+  }); // module: chai/utils/eql.js
+
+  require.register("chai/utils/flag.js", function(module, exports, require){
+    /*!
+     * Chai - flag utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+    /**
+     * ### flag(object ,key, [value])
+     *
+     * Get or set a flag value on an object. If a
+     * value is provided it will be set, else it will
+     * return the currently set value or `undefined` if
+     * the value is not set.
+     *
+     *     utils.flag(this, 'foo', 'bar'); // setter
+     *     utils.flag(this, 'foo'); // getter, returns `bar`
+     *
+     * @param {Object} object (constructed Assertion
+     * @param {String} key
+     * @param {Mixed} value (optional)
+     * @name flag
+     * @api private
+     */
+
+    module.exports = function (obj, key, value) {
+      var flags = obj.__flags || (obj.__flags = Object.create(null));
+      if (arguments.length === 3) {
+        flags[key] = value;
+      } else {
+        return flags[key];
+      }
+    };
+
+  }); // module: chai/utils/flag.js
+
+  require.register("chai/utils/getActual.js", function(module, exports, require){
+    /*!
+     * Chai - getActual utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+    /**
+     * # getActual(object, [actual])
+     *
+     * Returns the `actual` value for an Assertion
+     *
+     * @param {Object} object (constructed Assertion)
+     * @param {Arguments} chai.Assertion.prototype.assert arguments
+     */
+
+    module.exports = function (obj, args) {
+      var actual = args[4];
+      return 'undefined' !== actual ? actual : obj.obj;
+    };
+
+  }); // module: chai/utils/getActual.js
+
+  require.register("chai/utils/getMessage.js", function(module, exports, require){
+    /*!
+     * Chai - message composition utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+    /*!
+     * Module dependancies
+     */
+
+    var flag = require('./flag')
+      , getActual = require('./getActual')
+      , inspect = require('./inspect');
+
+    /**
+     * # getMessage(object, message, negateMessage)
+     *
+     * Construct the error message based on flags
+     * and template tags. Template tags will return
+     * a stringified inspection of the object referenced.
+     *
+     * Messsage template tags:
+     * - `#{this}` current asserted object
+     * - `#{act}` actual value
+     * - `#{exp}` expected value
+     *
+     * @param {Object} object (constructed Assertion)
+     * @param {Arguments} chai.Assertion.prototype.assert arguments
+     */
+
+    module.exports = function (obj, args) {
+      var negate = flag(obj, 'negate')
+        , val = flag(obj, 'object')
+        , expected = args[3]
+        , actual = getActual(obj, args)
+        , msg = negate ? args[2] : args[1]
+        , flagMsg = flag(obj, 'message');
+
+      msg = msg || '';
+      msg = msg
+        .replace(/#{this}/g, inspect(val))
+        .replace(/#{act}/g, inspect(actual))
+        .replace(/#{exp}/g, inspect(expected));
+
+      return flagMsg ? flagMsg + ': ' + msg : msg;
+    };
+
+  }); // module: chai/utils/getMessage.js
+
+  require.register("chai/utils/getName.js", function(module, exports, require){
+    /*!
+     * Chai - getName utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+    /**
+     * # getName(func)
+     *
+     * Gets the name of a function, in a cross-browser way.
+     *
+     * @param {Function} a function (usually a constructor)
+     */
+
+    module.exports = function (func) {
+      if (func.name) return func.name;
+
+      var match = /^\s?function ([^(]*)\(/.exec(func);
+      return match && match[1] ? match[1] : "";
+    };
+
+  }); // module: chai/utils/getName.js
+
+  require.register("chai/utils/getPathValue.js", function(module, exports, require){
+    /*!
+     * Chai - getPathValue utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * @see https://github.com/logicalparadox/filtr
+     * MIT Licensed
+     */
+
+    /**
+     * ### .getPathValue(path, object)
+     *
+     * This allows the retrieval of values in an
+     * object given a string path.
+     *
+     *     var obj = {
+     *         prop1: {
+     *             arr: ['a', 'b', 'c']
+     *           , str: 'Hello'
+     *         }
+     *       , prop2: {
+     *             arr: [ { nested: 'Universe' } ]
+     *           , str: 'Hello again!'
+     *         }
+     *     }
+     *
+     * The following would be the results.
+     *
+     *     getPathValue('prop1.str', obj); // Hello
+     *     getPathValue('prop1.att[2]', obj); // b
+     *     getPathValue('prop2.arr[0].nested', obj); // Universe
+     *
+     * @param {String} path
+     * @param {Object} object
+     * @returns {Object} value or `undefined`
+     * @name getPathValue
+     * @api public
+     */
+
+    var getPathValue = module.exports = function (path, obj) {
+      var parsed = parsePath(path);
+      return _getPathValue(parsed, obj);
+    };
+
+    /*!
+     * ## parsePath(path)
+     *
+     * Helper function used to parse string object
+     * paths. Use in conjunction with `_getPathValue`.
+     *
+     *      var parsed = parsePath('myobject.property.subprop');
+     *
+     * ### Paths:
+     *
+     * * Can be as near infinitely deep and nested
+     * * Arrays are also valid using the formal `myobject.document[3].property`.
+     *
+     * @param {String} path
+     * @returns {Object} parsed
+     * @api private
+     */
+
+    function parsePath (path) {
+      var str = path.replace(/\[/g, '.[')
+        , parts = str.match(/(\\\.|[^.]+?)+/g);
+      return parts.map(function (value) {
+        var re = /\[(\d+)\]$/
+          , mArr = re.exec(value)
+        if (mArr) return { i: parseFloat(mArr[1]) };
+        else return { p: value };
+      });
+    };
+
+    /*!
+     * ## _getPathValue(parsed, obj)
+     *
+     * Helper companion function for `.parsePath` that returns
+     * the value located at the parsed address.
+     *
+     *      var value = getPathValue(parsed, obj);
+     *
+     * @param {Object} parsed definition from `parsePath`.
+     * @param {Object} object to search against
+     * @returns {Object|Undefined} value
+     * @api private
+     */
+
+    function _getPathValue (parsed, obj) {
+      var tmp = obj
+        , res;
+      for (var i = 0, l = parsed.length; i < l; i++) {
+        var part = parsed[i];
+        if (tmp) {
+          if ('undefined' !== typeof part.p)
+            tmp = tmp[part.p];
+          else if ('undefined' !== typeof part.i)
+            tmp = tmp[part.i];
+          if (i == (l - 1)) res = tmp;
+        } else {
+          res = undefined;
         }
       }
-    } else {
-      str = ctx.stylize('[Circular]', 'special');
+      return res;
+    };
+
+  }); // module: chai/utils/getPathValue.js
+
+  require.register("chai/utils/index.js", function(module, exports, require){
+    /*!
+     * chai
+     * Copyright(c) 2011 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
+
+    /*!
+     * Main exports
+     */
+
+    var exports = module.exports = {};
+
+    /*!
+     * test utility
+     */
+
+    exports.test = require('./test');
+
+    /*!
+     * message utility
+     */
+
+    exports.getMessage = require('./getMessage');
+
+    /*!
+     * actual utility
+     */
+
+    exports.getActual = require('./getActual');
+
+    /*!
+     * Inspect util
+     */
+
+    exports.inspect = require('./inspect');
+
+    /*!
+     * Flag utility
+     */
+
+    exports.flag = require('./flag');
+
+    /*!
+     * Flag transferring utility
+     */
+
+    exports.transferFlags = require('./transferFlags');
+
+    /*!
+     * Deep equal utility
+     */
+
+    exports.eql = require('./eql');
+
+    /*!
+     * Deep path value
+     */
+
+    exports.getPathValue = require('./getPathValue');
+
+    /*!
+     * Function name
+     */
+
+    exports.getName = require('./getName');
+
+    /*!
+     * add Property
+     */
+
+    exports.addProperty = require('./addProperty');
+
+    /*!
+     * add Method
+     */
+
+    exports.addMethod = require('./addMethod');
+
+    /*!
+     * overwrite Property
+     */
+
+    exports.overwriteProperty = require('./overwriteProperty');
+
+    /*!
+     * overwrite Method
+     */
+
+    exports.overwriteMethod = require('./overwriteMethod');
+
+    /*!
+     * Add a chainable method
+     */
+
+    exports.addChainableMethod = require('./addChainableMethod');
+
+
+  }); // module: chai/utils/index.js
+
+  require.register("chai/utils/inspect.js", function(module, exports, require){
+    // This is (almost) directly from Node.js utils
+    // https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/util.js
+
+    var getName = require('./getName');
+
+    module.exports = inspect;
+
+    /**
+     * Echos the value of a value. Trys to print the value out
+     * in the best way possible given the different types.
+     *
+     * @param {Object} obj The object to print out.
+     * @param {Boolean} showHidden Flag that shows hidden (not enumerable)
+     *    properties of objects.
+     * @param {Number} depth Depth in which to descend in object. Default is 2.
+     * @param {Boolean} colors Flag to turn on ANSI escape codes to color the
+     *    output. Default is false (no coloring).
+     */
+    function inspect(obj, showHidden, depth, colors) {
+      var ctx = {
+        showHidden: showHidden,
+        seen: [],
+        stylize: function (str) { return str; }
+      };
+      return formatValue(ctx, obj, (typeof depth === 'undefined' ? 2 : depth));
     }
-  }
-  if (typeof name === 'undefined') {
-    if (array && key.match(/^\d+$/)) {
-      return str;
+
+    function formatValue(ctx, value, recurseTimes) {
+      // Provide a hook for user-specified inspect functions.
+      // Check that value is an object with an inspect function on it
+      if (value && typeof value.inspect === 'function' &&
+          // Filter out the util module, it's inspect function is special
+          value.inspect !== exports.inspect &&
+          // Also filter out any prototype objects using the circular check.
+          !(value.constructor && value.constructor.prototype === value)) {
+        return value.inspect(recurseTimes);
+      }
+
+      // Primitive types cannot have properties
+      var primitive = formatPrimitive(ctx, value);
+      if (primitive) {
+        return primitive;
+      }
+
+      // Look up the keys of the object.
+      var visibleKeys = Object.keys(value);
+      var keys = ctx.showHidden ? Object.getOwnPropertyNames(value) : visibleKeys;
+
+      // Some type of object without properties can be shortcutted.
+      // In IE, errors have a single `stack` property, or if they are vanilla `Error`,
+      // a `stack` plus `description` property; ignore those for consistency.
+      if (keys.length === 0 || (isError(value) && (
+          (keys.length === 1 && keys[0] === 'stack') ||
+          (keys.length === 2 && keys[0] === 'description' && keys[1] === 'stack')
+         ))) {
+        if (typeof value === 'function') {
+          var name = getName(value);
+          var nameSuffix = name ? ': ' + name : '';
+          return ctx.stylize('[Function' + nameSuffix + ']', 'special');
+        }
+        if (isRegExp(value)) {
+          return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+        }
+        if (isDate(value)) {
+          return ctx.stylize(Date.prototype.toUTCString.call(value), 'date');
+        }
+        if (isError(value)) {
+          return formatError(value);
+        }
+      }
+
+      var base = '', array = false, braces = ['{', '}'];
+
+      // Make Array say that they are Array
+      if (isArray(value)) {
+        array = true;
+        braces = ['[', ']'];
+      }
+
+      // Make functions say that they are functions
+      if (typeof value === 'function') {
+        var name = getName(value);
+        var nameSuffix = name ? ': ' + name : '';
+        base = ' [Function' + nameSuffix + ']';
+      }
+
+      // Make RegExps say that they are RegExps
+      if (isRegExp(value)) {
+        base = ' ' + RegExp.prototype.toString.call(value);
+      }
+
+      // Make dates with properties first say the date
+      if (isDate(value)) {
+        base = ' ' + Date.prototype.toUTCString.call(value);
+      }
+
+      // Make error with message first say the error
+      if (isError(value)) {
+        return formatError(value);
+      }
+
+      if (keys.length === 0 && (!array || value.length == 0)) {
+        return braces[0] + base + braces[1];
+      }
+
+      if (recurseTimes < 0) {
+        if (isRegExp(value)) {
+          return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+        } else {
+          return ctx.stylize('[Object]', 'special');
+        }
+      }
+
+      ctx.seen.push(value);
+
+      var output;
+      if (array) {
+        output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
+      } else {
+        output = keys.map(function(key) {
+          return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
+        });
+      }
+
+      ctx.seen.pop();
+
+      return reduceToSingleString(output, base, braces);
     }
-    name = JSON.stringify('' + key);
-    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
-      name = name.substr(1, name.length - 2);
-      name = ctx.stylize(name, 'name');
-    } else {
-      name = name.replace(/'/g, "\\'")
-                 .replace(/\\"/g, '"')
-                 .replace(/(^"|"$)/g, "'");
-      name = ctx.stylize(name, 'string');
+
+
+    function formatPrimitive(ctx, value) {
+      switch (typeof value) {
+        case 'undefined':
+          return ctx.stylize('undefined', 'undefined');
+
+        case 'string':
+          var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
+                                                   .replace(/'/g, "\\'")
+                                                   .replace(/\\"/g, '"') + '\'';
+          return ctx.stylize(simple, 'string');
+
+        case 'number':
+          return ctx.stylize('' + value, 'number');
+
+        case 'boolean':
+          return ctx.stylize('' + value, 'boolean');
+      }
+      // For some reason typeof null is "object", so special case here.
+      if (value === null) {
+        return ctx.stylize('null', 'null');
+      }
     }
-  }
-
-  return name + ': ' + str;
-}
 
 
-function reduceToSingleString(output, base, braces) {
-  var numLinesEst = 0;
-  var length = output.reduce(function(prev, cur) {
-    numLinesEst++;
-    if (cur.indexOf('\n') >= 0) numLinesEst++;
-    return prev + cur.length + 1;
-  }, 0);
+    function formatError(value) {
+      return '[' + Error.prototype.toString.call(value) + ']';
+    }
 
-  if (length > 60) {
-    return braces[0] +
-           (base === '' ? '' : base + '\n ') +
-           ' ' +
-           output.join(',\n  ') +
-           ' ' +
-           braces[1];
-  }
 
-  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
-}
+    function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
+      var output = [];
+      for (var i = 0, l = value.length; i < l; ++i) {
+        if (Object.prototype.hasOwnProperty.call(value, String(i))) {
+          output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+              String(i), true));
+        } else {
+          output.push('');
+        }
+      }
+      keys.forEach(function(key) {
+        if (!key.match(/^\d+$/)) {
+          output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+              key, true));
+        }
+      });
+      return output;
+    }
 
-function isArray(ar) {
-  return Array.isArray(ar) ||
-         (typeof ar === 'object' && objectToString(ar) === '[object Array]');
-}
 
-function isRegExp(re) {
-  return typeof re === 'object' && objectToString(re) === '[object RegExp]';
-}
+    function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
+      var name, str;
+      if (value.__lookupGetter__) {
+        if (value.__lookupGetter__(key)) {
+          if (value.__lookupSetter__(key)) {
+            str = ctx.stylize('[Getter/Setter]', 'special');
+          } else {
+            str = ctx.stylize('[Getter]', 'special');
+          }
+        } else {
+          if (value.__lookupSetter__(key)) {
+            str = ctx.stylize('[Setter]', 'special');
+          }
+        }
+      }
+      if (visibleKeys.indexOf(key) < 0) {
+        name = '[' + key + ']';
+      }
+      if (!str) {
+        if (ctx.seen.indexOf(value[key]) < 0) {
+          if (recurseTimes === null) {
+            str = formatValue(ctx, value[key], null);
+          } else {
+            str = formatValue(ctx, value[key], recurseTimes - 1);
+          }
+          if (str.indexOf('\n') > -1) {
+            if (array) {
+              str = str.split('\n').map(function(line) {
+                return '  ' + line;
+              }).join('\n').substr(2);
+            } else {
+              str = '\n' + str.split('\n').map(function(line) {
+                return '   ' + line;
+              }).join('\n');
+            }
+          }
+        } else {
+          str = ctx.stylize('[Circular]', 'special');
+        }
+      }
+      if (typeof name === 'undefined') {
+        if (array && key.match(/^\d+$/)) {
+          return str;
+        }
+        name = JSON.stringify('' + key);
+        if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
+          name = name.substr(1, name.length - 2);
+          name = ctx.stylize(name, 'name');
+        } else {
+          name = name.replace(/'/g, "\\'")
+                     .replace(/\\"/g, '"')
+                     .replace(/(^"|"$)/g, "'");
+          name = ctx.stylize(name, 'string');
+        }
+      }
 
-function isDate(d) {
-  return typeof d === 'object' && objectToString(d) === '[object Date]';
-}
+      return name + ': ' + str;
+    }
 
-function isError(e) {
-  return typeof e === 'object' && objectToString(e) === '[object Error]';
-}
 
-function objectToString(o) {
-  return Object.prototype.toString.call(o);
-}
+    function reduceToSingleString(output, base, braces) {
+      var numLinesEst = 0;
+      var length = output.reduce(function(prev, cur) {
+        numLinesEst++;
+        if (cur.indexOf('\n') >= 0) numLinesEst++;
+        return prev + cur.length + 1;
+      }, 0);
 
-}); // module: chai/utils/inspect.js
+      if (length > 60) {
+        return braces[0] +
+               (base === '' ? '' : base + '\n ') +
+               ' ' +
+               output.join(',\n  ') +
+               ' ' +
+               braces[1];
+      }
 
-require.register("chai/utils/overwriteMethod.js", function(module, exports, require){
-/*!
- * Chai - overwriteMethod utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
+      return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
+    }
 
-/**
- * ### overwriteMethod (ctx, name, fn)
- *
- * Overwites an already existing method and provides
- * access to previous function. Must return function
- * to be used for name.
- *
- *     utils.overwriteMethod(chai.Assertion.prototype, 'equal', function (_super) {
- *       return function (str) {
- *         var obj = utils.flag(this, 'object');
- *         if (obj instanceof Foo) {
- *           new chai.Assertion(obj.value).to.equal(str);
- *         } else {
- *           _super.apply(this, arguments);
- *         }
- *       }
- *     });
- *
- * Can also be accessed directly from `chai.Assertion`.
- *
- *     chai.Assertion.overwriteMethod('foo', fn);
- *
- * Then can be used as any other assertion.
- *
- *     expect(myFoo).to.equal('bar');
- *
- * @param {Object} ctx object whose method is to be overwritten
- * @param {String} name of method to overwrite
- * @param {Function} method function that returns a function to be used for name
- * @name overwriteMethod
- * @api public
- */
+    function isArray(ar) {
+      return Array.isArray(ar) ||
+             (typeof ar === 'object' && objectToString(ar) === '[object Array]');
+    }
 
-module.exports = function (ctx, name, method) {
-  var _method = ctx[name]
-    , _super = function () { return this; };
+    function isRegExp(re) {
+      return typeof re === 'object' && objectToString(re) === '[object RegExp]';
+    }
 
-  if (_method && 'function' === typeof _method)
-    _super = _method;
+    function isDate(d) {
+      return typeof d === 'object' && objectToString(d) === '[object Date]';
+    }
 
-  ctx[name] = function () {
-    var result = method(_super).apply(this, arguments);
-    return result === undefined ? this : result;
-  }
-};
+    function isError(e) {
+      return typeof e === 'object' && objectToString(e) === '[object Error]';
+    }
 
-}); // module: chai/utils/overwriteMethod.js
+    function objectToString(o) {
+      return Object.prototype.toString.call(o);
+    }
 
-require.register("chai/utils/overwriteProperty.js", function(module, exports, require){
-/*!
- * Chai - overwriteProperty utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
+  }); // module: chai/utils/inspect.js
 
-/**
- * ### overwriteProperty (ctx, name, fn)
- *
- * Overwites an already existing property getter and provides
- * access to previous value. Must return function to use as getter.
- *
- *     utils.overwriteProperty(chai.Assertion.prototype, 'ok', function (_super) {
- *       return function () {
- *         var obj = utils.flag(this, 'object');
- *         if (obj instanceof Foo) {
- *           new chai.Assertion(obj.name).to.equal('bar');
- *         } else {
- *           _super.call(this);
- *         }
- *       }
- *     });
- *
- *
- * Can also be accessed directly from `chai.Assertion`.
- *
- *     chai.Assertion.overwriteProperty('foo', fn);
- *
- * Then can be used as any other assertion.
- *
- *     expect(myFoo).to.be.ok;
- *
- * @param {Object} ctx object whose property is to be overwritten
- * @param {String} name of property to overwrite
- * @param {Function} getter function that returns a getter function to be used for name
- * @name overwriteProperty
- * @api public
- */
+  require.register("chai/utils/overwriteMethod.js", function(module, exports, require){
+    /*!
+     * Chai - overwriteMethod utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
 
-module.exports = function (ctx, name, getter) {
-  var _get = Object.getOwnPropertyDescriptor(ctx, name)
-    , _super = function () {};
+    /**
+     * ### overwriteMethod (ctx, name, fn)
+     *
+     * Overwites an already existing method and provides
+     * access to previous function. Must return function
+     * to be used for name.
+     *
+     *     utils.overwriteMethod(chai.Assertion.prototype, 'equal', function (_super) {
+     *       return function (str) {
+     *         var obj = utils.flag(this, 'object');
+     *         if (obj instanceof Foo) {
+     *           new chai.Assertion(obj.value).to.equal(str);
+     *         } else {
+     *           _super.apply(this, arguments);
+     *         }
+     *       }
+     *     });
+     *
+     * Can also be accessed directly from `chai.Assertion`.
+     *
+     *     chai.Assertion.overwriteMethod('foo', fn);
+     *
+     * Then can be used as any other assertion.
+     *
+     *     expect(myFoo).to.equal('bar');
+     *
+     * @param {Object} ctx object whose method is to be overwritten
+     * @param {String} name of method to overwrite
+     * @param {Function} method function that returns a function to be used for name
+     * @name overwriteMethod
+     * @api public
+     */
 
-  if (_get && 'function' === typeof _get.get)
-    _super = _get.get
+    module.exports = function (ctx, name, method) {
+      var _method = ctx[name]
+        , _super = function () { return this; };
 
-  Object.defineProperty(ctx, name,
-    { get: function () {
-        var result = getter(_super).call(this);
+      if (_method && 'function' === typeof _method)
+        _super = _method;
+
+      ctx[name] = function () {
+        var result = method(_super).apply(this, arguments);
         return result === undefined ? this : result;
       }
-    , configurable: true
-  });
-};
+    };
 
-}); // module: chai/utils/overwriteProperty.js
+  }); // module: chai/utils/overwriteMethod.js
 
-require.register("chai/utils/test.js", function(module, exports, require){
-/*!
- * Chai - test utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
+  require.register("chai/utils/overwriteProperty.js", function(module, exports, require){
+    /*!
+     * Chai - overwriteProperty utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
 
-/*!
- * Module dependancies
- */
+    /**
+     * ### overwriteProperty (ctx, name, fn)
+     *
+     * Overwites an already existing property getter and provides
+     * access to previous value. Must return function to use as getter.
+     *
+     *     utils.overwriteProperty(chai.Assertion.prototype, 'ok', function (_super) {
+     *       return function () {
+     *         var obj = utils.flag(this, 'object');
+     *         if (obj instanceof Foo) {
+     *           new chai.Assertion(obj.name).to.equal('bar');
+     *         } else {
+     *           _super.call(this);
+     *         }
+     *       }
+     *     });
+     *
+     *
+     * Can also be accessed directly from `chai.Assertion`.
+     *
+     *     chai.Assertion.overwriteProperty('foo', fn);
+     *
+     * Then can be used as any other assertion.
+     *
+     *     expect(myFoo).to.be.ok;
+     *
+     * @param {Object} ctx object whose property is to be overwritten
+     * @param {String} name of property to overwrite
+     * @param {Function} getter function that returns a getter function to be used for name
+     * @name overwriteProperty
+     * @api public
+     */
 
-var flag = require('./flag');
+    module.exports = function (ctx, name, getter) {
+      var _get = Object.getOwnPropertyDescriptor(ctx, name)
+        , _super = function () {};
 
-/**
- * # test(object, expression)
- *
- * Test and object for expression.
- *
- * @param {Object} object (constructed Assertion)
- * @param {Arguments} chai.Assertion.prototype.assert arguments
- */
+      if (_get && 'function' === typeof _get.get)
+        _super = _get.get
 
-module.exports = function (obj, args) {
-  var negate = flag(obj, 'negate')
-    , expr = args[0];
-  return negate ? !expr : expr;
-};
+      Object.defineProperty(ctx, name,
+        { get: function () {
+            var result = getter(_super).call(this);
+            return result === undefined ? this : result;
+          }
+        , configurable: true
+      });
+    };
 
-}); // module: chai/utils/test.js
+  }); // module: chai/utils/overwriteProperty.js
 
-require.register("chai/utils/transferFlags.js", function(module, exports, require){
-/*!
- * Chai - transferFlags utility
- * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
- * MIT Licensed
- */
+  require.register("chai/utils/test.js", function(module, exports, require){
+    /*!
+     * Chai - test utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
 
-/**
- * ### transferFlags(assertion, object, includeAll = true)
- *
- * Transfer all the flags for `assertion` to `object`. If
- * `includeAll` is set to `false`, then the base Chai
- * assertion flags (namely `object`, `ssfi`, and `message`)
- * will not be transferred.
- *
- *
- *     var newAssertion = new Assertion();
- *     utils.transferFlags(assertion, newAssertion);
- *
- *     var anotherAsseriton = new Assertion(myObj);
- *     utils.transferFlags(assertion, anotherAssertion, false);
- *
- * @param {Assertion} assertion the assertion to transfer the flags from
- * @param {Object} object the object to transfer the flags too; usually a new assertion
- * @param {Boolean} includeAll
- * @name getAllFlags
- * @api private
- */
+    /*!
+     * Module dependancies
+     */
 
-module.exports = function (assertion, object, includeAll) {
-  var flags = assertion.__flags || (assertion.__flags = Object.create(null));
+    var flag = require('./flag');
 
-  if (!object.__flags) {
-    object.__flags = Object.create(null);
-  }
+    /**
+     * # test(object, expression)
+     *
+     * Test and object for expression.
+     *
+     * @param {Object} object (constructed Assertion)
+     * @param {Arguments} chai.Assertion.prototype.assert arguments
+     */
 
-  includeAll = arguments.length === 3 ? includeAll : true;
+    module.exports = function (obj, args) {
+      var negate = flag(obj, 'negate')
+        , expr = args[0];
+      return negate ? !expr : expr;
+    };
 
-  for (var flag in flags) {
-    if (includeAll ||
-        (flag !== 'object' && flag !== 'ssfi' && flag != 'message')) {
-      object.__flags[flag] = flags[flag];
-    }
-  }
-};
+  }); // module: chai/utils/test.js
 
-}); // module: chai/utils/transferFlags.js
+  require.register("chai/utils/transferFlags.js", function(module, exports, require){
+    /*!
+     * Chai - transferFlags utility
+     * Copyright(c) 2012 Jake Luer <jake@alogicalparadox.com>
+     * MIT Licensed
+     */
 
+    /**
+     * ### transferFlags(assertion, object, includeAll = true)
+     *
+     * Transfer all the flags for `assertion` to `object`. If
+     * `includeAll` is set to `false`, then the base Chai
+     * assertion flags (namely `object`, `ssfi`, and `message`)
+     * will not be transferred.
+     *
+     *
+     *     var newAssertion = new Assertion();
+     *     utils.transferFlags(assertion, newAssertion);
+     *
+     *     var anotherAsseriton = new Assertion(myObj);
+     *     utils.transferFlags(assertion, anotherAssertion, false);
+     *
+     * @param {Assertion} assertion the assertion to transfer the flags from
+     * @param {Object} object the object to transfer the flags too; usually a new assertion
+     * @param {Boolean} includeAll
+     * @name getAllFlags
+     * @api private
+     */
+
+    module.exports = function (assertion, object, includeAll) {
+      var flags = assertion.__flags || (assertion.__flags = Object.create(null));
+
+      if (!object.__flags) {
+        object.__flags = Object.create(null);
+      }
+
+      includeAll = arguments.length === 3 ? includeAll : true;
+
+      for (var flag in flags) {
+        if (includeAll ||
+            (flag !== 'object' && flag !== 'ssfi' && flag != 'message')) {
+          object.__flags[flag] = flags[flag];
+        }
+      }
+    };
+
+  }); // module: chai/utils/transferFlags.js
+
+  require.alias("./chai.js", "chai");
 
   return require('chai');
-});
\ No newline at end of file
+});