诗歌rails之用RSpec测试你的Rails程序

Rails虽然自带有Controller、Model、Integration的测试框架，但是用起来感觉很枯燥无味
所以，你应该试试RSpec+Mocha这道纯正的墨西哥菜

RSpec is a framework which provides programmers with a Domain Specific Language to describe the behaviour of
Ruby code with readable, executable examples that guide you in the design process and serve well as both
documentation and tests.

RSpec针对我们Ruby以及Rails的测试工作精心制作了一套独具风味的DSL大餐，让我们来尝尝鲜:

describe MenuItemsController, "creating a new menu item" do
  integrate_views
  fixtures :menu_items

  it "should redirect to index with a notice on successful save" do
    MenuItem.any_instance.stubs(:valid?).returns(true)
    post 'create'
    assigns[:menu_item].should_not be_new_record
    flash[:notice].should_not be_nil
    response.should redirect_to(menu_items_path)
  end

  it "should re-render new template on failed save" do
    MenuItem.any_instance.stubs(:valid?).returns(false)
    post 'create'
    assigns[:menu_item].should be_new_record
    flash[:notice].should be_nil
    response.should render_template('new')
  end

  it "should pass params to menu item" do
    post 'create', :menu_item => { :name => 'Plain' }
    assigns[:menu_item].name.should == 'Plain'
  end

end

describe MenuItemsController, "creating a new menu item" do   integrate_views   fixtures :menu_items    it "should redirect to index with a notice on successful save" do     MenuItem.any_instance.stubs(:valid?).returns(true)     post 'create'     assigns[:menu_item].should_not be_new_record     flash[:notice].should_not be_nil     response.should redirect_to(menu_items_path)   end    it "should re-render new template on failed save" do     MenuItem.any_instance.stubs(:valid?).returns(false)     post 'create'     assigns[:menu_item].should be_new_record     flash[:notice].should be_nil     response.should render_template('new')   end    it "should pass params to menu item" do     post 'create', :menu_item => { :name => 'Plain' }     assigns[:menu_item].name.should == 'Plain'   end  end 

这是一段测试MenuItemsController的代码，可读性强大到像是在talking，像是用我们的母语在“说”测试！
回想一下传统的Controller测试:

class MenuItemsControllerTest < Test::Unit::TestCase

  def setup
    @controller = MenuItemsController.new
    @request    = ActionController::TestRequest.new
    @response   = ActionController::TestResponse.new
  end

  def test_create_with_valid_menu_item
    assert_difference(MenuItem, :count, 1) do
      post :create, :menu_item => {:name => 'Classic',
                                   :price => 4.99}
    end

    assert_not_nil assigns(:menu_item)
    assert_not_nil flash[:notice]
    assert_redirected_to menu_items_url
  end

  def test_create_with_invalid_menu_item
    assert_difference(MenuItem, :count, 0) do
      post :create, :menu_item => { }
    end

    assert_not_nil assigns(:menu_item)
    assert_nil flash[:notice]
    assert_response :success
    assert_template 'new'
  end

end

class MenuItemsControllerTest < Test::Unit::TestCase      def setup     @controller = MenuItemsController.new     @request    = ActionController::TestRequest.new     @response   = ActionController::TestResponse.new   end    def test_create_with_valid_menu_item     assert_difference(MenuItem, :count, 1) do       post :create, :menu_item => {:name => 'Classic',                                     :price => 4.99}     end            assert_not_nil assigns(:menu_item)     assert_not_nil flash[:notice]     assert_redirected_to menu_items_url   end      def test_create_with_invalid_menu_item     assert_difference(MenuItem, :count, 0) do       post :create, :menu_item => { }     end        assert_not_nil assigns(:menu_item)     assert_nil flash[:notice]     assert_response :success     assert_template 'new'   end  end 

RSpec对Rails的Controllers、Models、Views、Helpers、Plugin、Integration等等测试都已经支持的很好或者即将支持
RSpec这套专有DSL，再加上Mocha这一强大的mocking和stubbing库，简直就是珠联璧合，所向无敌了！

Rspec集成Mocha

关键字: rspec mocha

Rspec
Mocha
集成方法就是在spec_helper.rb里配置一下:

config.mock_with :mocha

config.mock_with :mocha 

这样就可以在Rspec测试中使用Mocha了

如果你想测试你的Rails应用，你应该看看这份文档:RSpec::Rails