Tone.js/test/control/CtrlPattern.js

define(["Tone/control/CtrlPattern", "helper/Basic"], function (CtrlPattern, Basic) {

	describe("CtrlPattern", function(){

		Basic(CtrlPattern);

		context("API", function(){

			it("can be constructed with an array and type", function(){
				var pattern = new CtrlPattern([0, 1, 2, 3], "down");
				expect(pattern.values).to.deep.equal([0, 1, 2, 3]);
				expect(pattern.type).to.equal("down");
				pattern.dispose();
			});

			it("can be constructed with an object", function(){
				var pattern = new CtrlPattern({
					values : [1, 2, 3],
					type : "upDown"
				});
				expect(pattern.values).to.deep.equal([1, 2, 3]);
				expect(pattern.type).to.equal("upDown");
				pattern.dispose();
			});

			it("returns undefined with no pattern", function(){
				var pattern = new CtrlPattern();
				expect(pattern.next()).to.be.undefined;
				pattern.dispose();
			});

			it("can set the index", function(){
				var pattern = new CtrlPattern([0, 2, 3, 4]);
				pattern.index = 2;
				expect(pattern.index).to.be.equal(2);
				pattern.dispose();
			});

			it("can be resized smaller when the index is after the previous length", function(){
				var pattern = new CtrlPattern([0, 1, 2, 3, 4]);
				pattern.index = 2;
				pattern.next();
				expect(pattern.index).to.equal(3);
				pattern.values = [0, 1, 2];
				expect(pattern.next()).to.equal(0);
				expect(pattern.index).to.equal(0);
				pattern.dispose();
			});
		});

		context("Patterns", function(){

			it("does the up pattern", function(){
				var pattern = new CtrlPattern([0, 1, 2, 3], "up");
				var output = [];
				for (var i = 0; i < 6; i++){
					output[i] = pattern.value;
					pattern.next();
				}
				expect(output).to.deep.equal([0, 1, 2, 3, 0, 1]);
				pattern.dispose();
			});

			it("does the down pattern", function(){
				var pattern = new CtrlPattern([0, 1, 2, 3], "down");
				var output = [];
				for (var i = 0; i < 6; i++){
					output[i] = pattern.value;
					pattern.next();
				}
				expect(output).to.deep.equal([3, 2, 1, 0, 3, 2]);
				pattern.dispose();
			});

			it("does the upDown pattern", function(){
				var pattern = new CtrlPattern([0, 1, 2, 3], "upDown");
				var output = [];
				for (var i = 0; i < 10; i++){
					output[i] = pattern.value;
					pattern.next();
				}
				expect(output).to.deep.equal([0, 1, 2, 3, 2, 1, 0, 1, 2, 3]);
				pattern.dispose();
			});

			it("does the downUp pattern", function(){
				var pattern = new CtrlPattern([0, 1, 2, 3], "downUp");
				var output = [];
				for (var i = 0; i < 10; i++){
					output[i] = pattern.value;
					pattern.next();
				}
				expect(output).to.deep.equal([3, 2, 1, 0, 1, 2, 3, 2, 1, 0]);
				pattern.dispose();
			});

			it("does the alternateUp pattern", function(){
				var pattern = new CtrlPattern([0, 1, 2, 3, 4], "alternateUp");
				var output = [];
				for (var i = 0; i < 10; i++){
					output[i] = pattern.value;
					pattern.next();
				}
				expect(output).to.deep.equal([0, 2, 1, 3, 2, 4, 3, 0, 2, 1]);
				pattern.dispose();
			});

			it("does the alternateDown pattern", function(){
				var pattern = new CtrlPattern([0, 1, 2, 3, 4], "alternateDown");
				var output = [];
				for (var i = 0; i < 10; i++){
					output[i] = pattern.value;
					pattern.next();
				}
				expect(output).to.deep.equal([4, 2, 3, 1, 2, 0, 1, 4, 2, 3]);
				pattern.dispose();
			});

			it("outputs random elements form the values", function(){
				var pattern = new CtrlPattern([0, 1, 2, 3, 4], "random");
				for (var i = 0; i < 10; i++){
					var output = pattern.value;
					pattern.next();
					expect(pattern.values.indexOf(output)).to.not.equal(-1);
				}
				pattern.dispose();
			});

			it("does a randomWalk", function(){
				var pattern = new CtrlPattern([0, 1, 2, 3, 4], "randomWalk");
				pattern.index = 2;
				expect(pattern.value).to.equal(2);
				pattern.next();
				//has moved one away
				expect(Math.abs(pattern.index - 2)).to.equal(1);
				var currentIndex = pattern.index;
				//moved another one away
				pattern.next();
				expect(Math.abs(pattern.index - currentIndex)).to.equal(1);
				pattern.dispose();
			});

			it("does randomOnce pattern", function(){
				var pattern = new CtrlPattern([4, 5, 6, 7, 8], "randomOnce");
				var output = [];
				var i;
				for (i = 0; i < 5; i++){
					output[i] = pattern.value;
					pattern.next();
				}
				output = output.sort();
				expect(output).to.deep.equal([4, 5, 6, 7, 8]);
				pattern.dispose();
			});
		});
	});
});