Rubyonrails 如何在 Rails 4 中测试控制器关注点

在你的"范围"中包含了许多控制器示例，告诉你如何使用它们.

我个人认为这比杀戮更重要，更喜欢单独执行单元测试，然后使用集成测试来确认控制器的行为.

Method 1: without routing or response testing

创建一个假控制器并测试其方法:

describe MyControllerConcern do
  before do
    class FakesController < ApplicationController
      include MyControllerConcern
    end
  end

  after do
    Object.send :remove_const, :FakesController 
  end

  let(:object) { FakesController.new }

  it 'my_method_to_test' do
    expect(object).to eq('expected result')
  end

end

Method 2: testing response

当您的问题包含路由或需要测试响应、渲染等时...您需要使用匿名控制器运行测试.这允许您访问所有与控制器相关的rspec方法和帮助程序:

describe MyControllerConcern, type: :controller do
  controller(ApplicationController) do
    include MyControllerConcern

    def fake_action; redirect_to '/an_url'; end
  end

  before do
    routes.draw {
      get 'fake_action' => 'anonymous#fake_action'
    }
  end
    
  describe 'my_method_to_test' do
    before do
      get :fake_action 
    end

    it do
      expect(response).to redirect_to('/an_url') 
    end
  end
end

如您所见，我们用controller(ApplicationController)定义匿名控制器.如果你的考试涉及ApplicationController以外的其他课程，你需要调整这个.

此外，要使其正常工作，您必须在spec_helper.rb文件中配置以下内容:

config.infer_base_class_for_anonymous_controllers = true

Note: keep testing that your concern is included

同样重要的是，测试你的关注类是否包含在目标类中，一行就足够了:

describe SomeTargetedController do
  it 'includes MyControllerConcern' do
    expect(SomeTargetedController.ancestors.include? MyControllerConcern).to be(true) 
  end
end