Rspec測試設計失敗，因爲指定始終爲零

Question

我有設計的控制器測試，但它總是失敗，因爲指定總是返回零，請幫助找到問題的位置，謝謝！

posts_controller_spec.rb：

RSpec.describe PostsController, :type => :controller do 
    describe "with valid session" do 
     describe "GET index" do 
     it "assigns all posts as @posts" do 
      sign_in :admin, @user 
      post = create(:post) 
      get :index, {} 
      expect(assigns(:posts)).to eq([post]) 
     end 
     end 
    end 
    ... 
end 

posts_controller.rb

class PostsController < ApplicationController 

    before_action :authenticate_user! 
    before_action :set_post, only: [:show, :edit, :update, :destroy] 

    # GET /posts 
    # GET /posts.json 
    def index 
    @posts = Post.all 
    end 
    ... 
end 

我已經包括在規範制定測試傭工/ rails_helper.rb

config.include Devise::TestHelpers, type: :controller 

在我的情況下，後在管理員範圍內，不確定是否有區別（功能測試不通過路由？），所以我只包括我的routes.rb這裏

的routes.rb：

Rails.application.routes.draw do 
    root to: 'home#index' 
    get 'admin', to: 'admin#index' 
    devise_for :users 
    scope '/admin' do 
    resources :posts 
    end 
end 

而且從RSpec的最後，輸出：

1) PostsController with valid session GET index assigns all posts as @posts 
    Failure/Error: expect(assigns(:posts)).to eq([post]) 

    expected: [#<Post id: 57, title: "MyText", body: "MyText", image_url: "MyString", created_at: "2014-09-02 14:36:01", updated_at: "2014-09-02 14:36:01", user_id: 1>] 
     got: nil 

    (compared using ==) 
# ./spec/controllers/posts_controller_spec.rb:53:in `block (4 levels) in <top (required)>' 

我讀過這個線程rspec test of my controller returns nil (+factory girl)，跟着建議將get :index更改爲controller.index。建議是，如果通過測試，那麼這是一個路由問題。它通過測試，但我仍然不知道在哪裏的路由問題是，爲什麼get :index是不工作...

Answer 1

它只是一個小錯誤：使用設計之前sign_in創建一個用戶

RSpec.describe PostsController, :type => :controller do 

    describe "with valid session" do 

    let (:user) { create(:user) } 

     describe "GET index" do 
     it "assigns all posts as @posts" do 
      sign_in user 
      post = create(:post) 
      get :index, {} 
      expect(assigns(:posts)).to eq([post]) 
     end 
     ... 
     end 
    end 
end