Add a RSpec generator and hook to create default decorator specs

lib/generators/draper/decorator/decorator_generator.rb

@@ -13,5 +13,7 @@ module Draper
       end
       template 'decorator.rb', "#{DECORATORS_ROOT}#{singular_name}_decorator.rb"
     end
+
+    hook_for :test_framework
   end
-end
+end

lib/generators/rspec/decorator_generator.rb

@@ -0,0 +1,17 @@
+module Rspec
+  class DecoratorGenerator < ::Rails::Generators::NamedBase
+    source_root File.expand_path('../templates', __FILE__)
+
+    SPEC_ROOT = 'spec/decorators/'
+    APPLICATION_DECORATOR_SPEC = 'application_decorator_spec.rb'
+    APPLICATION_DECORATOR_SPEC_PATH = SPEC_ROOT + APPLICATION_DECORATOR_SPEC
+
+    def build_model_and_application_decorator_specs
+      empty_directory SPEC_ROOT
+      unless File.exists?(APPLICATION_DECORATOR_SPEC_PATH)
+        template APPLICATION_DECORATOR_SPEC, APPLICATION_DECORATOR_SPEC_PATH
+      end
+      template 'decorator_spec.rb', "#{SPEC_ROOT}#{singular_name}_decorator_spec.rb"
+    end
+  end
+end

lib/generators/rspec/templates/application_decorator_spec.rb

@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe ApplicationDecorator do
+  before { ApplicationController.new.set_current_view_context }
+end

lib/generators/rspec/templates/decorator_spec.rb

@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe <%= singular_name.camelize %>Decorator do
+  before { ApplicationController.new.set_current_view_context }
+end

spec/generators/rspec/decorator_generator_spec.rb

@@ -0,0 +1,28 @@
+require 'spec_helper'
+
+# Generators are not automatically loaded by Rails
+require 'generators/rspec/decorator_generator'
+
+describe Rspec::DecoratorGenerator do
+  # Tell the generator where to put its output (what it thinks of as Rails.root)
+  destination File.expand_path("../../../../tmp", __FILE__)
+
+  before { prepare_destination }
+
+  describe 'no arguments' do
+    before { run_generator %w(products)  }
+
+    describe 'spec/decorators/application_decorator_spec.rb' do
+      subject { file('spec/decorators/application_decorator_spec.rb') }
+      it { should exist }
+      it { should contain "describe ApplicationDecorator do" }
+    end
+
+    describe 'spec/decorators/products_decorator_spec.rb' do
+      subject { file('spec/decorators/products_decorator_spec.rb') }
+      it { should exist }
+      it { should contain "describe ProductsDecorator" }
+    end
+
+  end
+end