Plugin type declaration and unit test

Signed-off-by: Clinton Wolfe <clintoncwolfe@gmail.com>

lib/inspec/plugin/v2/plugin_types/input.rb

@@ -0,0 +1,5 @@
+module Inspec::Plugin::V2::PluginType
+  class Input < Inspec::Plugin::V2::PluginBase
+    register_plugin_type(:input)
+  end
+end

test/unit/plugin/v2/api_input.rb

@@ -0,0 +1,35 @@
+require 'helper'
+
+describe 'Input plugin type' do
+  describe 'when registering the plugin type superclass' do
+    it 'returns the superclass when calling the global defintion method' do
+      klass = Inspec.plugin(2, :input)
+      klass.must_be_kind_of Class
+      klass.name.must_equal 'Inspec::Plugin::V2::PluginType::Input'
+    end
+
+    it 'returns the superclass when referenced by alias' do
+      klass = Inspec::Plugin::V2::PluginBase.base_class_for_type(:input)
+      klass.must_be_kind_of Class
+      klass.name.must_equal 'Inspec::Plugin::V2::PluginType::Input'
+    end
+
+    it 'registers an activation dsl method' do
+      klass = Inspec::Plugin::V2::PluginBase
+      klass.must_respond_to :input
+    end
+  end
+
+  describe 'when examining the specific plugin type API' do
+    [
+      # TODO - API instance methods
+      # fetch?
+      # default_priority?
+    ].each do |api_method|
+      it "should define an #{api_method} in the superclass" do
+        klass = Inspec::Plugin::V2::PluginType::CliCommand
+        klass.method_defined?(api_method).must_eq true
+      end
+    end
+  end
+end