Rspec / Capybara：测试是否调用了控制器方法

问题描述

假设我设置了一个具有索引操作的HomeController

  class HomeController< ApplicationController 
 def index 
 @users = User.all 
 end 
 end 
  

b $ b

并通过根路径路由到它。

  root：to => home＃index
  

为什么此请求规范失败

  it应该调用home＃index动作do 
 HomeController.should_receive（：index）
访问root_path 
 end 
 

 失败/错误：HomeController.should_receive（：index）
（< HomeController（class）>）。index（any args）
 expected：1 time 
 received：0 times 
  

？是因为索引方法被调用为一个实例方法而不是类方法？

解决方案

你想测试，我认为有什么方法可以在哪里使用的一些混乱，所以我会尝试和举例，，和（例如访问，具体取决于您的Rails / RSpec版本）：

spec / features / home_features_spec.rb >

 特性索引页do 
方案查看索引页do 
访问root_path 
 expect （page）.to have_text（Welcome to my awesome index page！）
 end 
 end 
  

Given I set up a HomeController with an index action

class HomeController < ApplicationController
  def index
    @users = User.all
  end
end

and routed to it via the root path,

  root :to => "home#index"

why does this request spec fail

it 'should called the home#index action' do
    HomeController.should_receive(:index)
    visit root_path
end

with the following message

 Failure/Error: HomeController.should_receive(:index)
   (<HomeController (class)>).index(any args)
       expected: 1 time
       received: 0 times

? Is it because the index method is called as a instance method instead of a class method?

解决方案

I'm not sure exactly what you want to test, and I think there's some confusion as to what methods can be used where, so I'll try and give examples of Routing specs, Request Specs, Controller specs, and Feature specs, and hopefully one of them will be appropriate for you.

Routing

If you want to make sure that your root path gets routed to the home#index action, a routing spec may be appropriate:

spec/routing/routing_spec.rb

describe "Routing" do
  it "routes / to home#index" do
    expect(get("/")).to route_to("home#index")
  end
end

Request

If you want to make sure that the index template gets rendered on a request to your root path, a request spec may be appropriate:

spec/requests/home_requests_spec.rb

describe "Home requests" do
  it 'successfully renders the index template on GET /' do
    get "/"
    expect(response).to be_successful
    expect(response).to render_template(:index)
  end
end

Controller

If you want to make sure that the index template gets rendered on a request to the index action of your HomeController, a controller spec may be appropriate (and quite similar to a request spec in this case, but focused exclusively on the controller):

spec/controllers/home_controller_spec.rb

describe HomeController do
  describe "GET index" do
    it "successfully renders the index template" do
      expect(controller).to receive(:index) # this line probably of dubious value
      get :index
      expect(response).to be_successful
      expect(response).to render_template(:index)
    end
  end
end

Feature

If you want to make sure the page rendered by home#index has some specific content, a feature spec may be appropriate (and also the only place you can use Capybara methods like visit, depending on your Rails/RSpec version):

spec/features/home_features_spec.rb

feature "Index page" do
  scenario "viewing the index page" do
    visit root_path
    expect(page).to have_text("Welcome to my awesome index page!")
  end
end

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