RSpec中的Rails命名空间控制器测试

Question

我的规格总体上可以正常工作，但是当我尝试测试嵌套控制器时，出现一个奇怪的错误。 因此，此代码模式subject(:create_action) { xhr :post, :create, post_id: post.id, post_comment: attributes_for(:post_comment, post_id: post.id, user: @user) }在我不兼容的控制器上正常工作嵌套，但是对于我的命名空间控制器，此处的测试it "saves the new task in the db会引发以下错误：

1) Posts::PostCommentRepliesController when user is logged in POST create with valid attributes saves the new task in the db
     Failure/Error: subject(:create_action) { xhr :post, :create, post_comment_id: post_comment.id, post: attributes_for(:post_comment_reply, post_comment: post_comment, user: @user) }

     ArgumentError:
       wrong number of arguments (4 for 0)

我应该怎么做才能使这项工作？ 如您所见，我将我的post_comments_controller_spec.rb放在specs/controllers/posts文件夹中，并要求posts/post_comments_controller ，但这无济于事。

routes.rb

resources :posts do
  resources :post_comments, only: [:create, :update, :destroy, :show], module: :posts
end

规格/控制器/帖子/post_comments_controller_spec.rb

require "rails_helper"
require "posts/post_comments_controller"

describe Posts::PostCommentsController do

  describe "when user is logged in" do

    before(:each) do
      login_user
    end

    it "should have a current_user" do
      expect(subject.current_user).to_not eq(nil)
    end

    describe "POST create" do
      let!(:profile) { create(:profile, user: @user) }
      let!(:post) { create(:post, user: @user) } 

      context "with valid attributes" do
        subject(:create_action) { xhr :post, :create, post_id: post.id, post_comment: attributes_for(:post_comment, post_id: post.id, user: @user) }

        it "saves the new task in the db" do
          expect{ create_action }.to change{ PostComment.count }.by(1)
        end
      end
    end
  end
end

Answer 1

这是一个有点奇怪的错误。 总之，你let!(:post) { ... }最后重写调用方法post所使用发出一个POST请求的例子组。

发生这种情况的原因是，当您在describe定义let ，RSpec会在给定的示例组中为您定义一个名称相同的方法 。

describe Post do
  let(:post) { Post.new }

  it "does something" do
    post.do_something
  end
end

xhr方法 （以及get ， post等）是从Rails本身进行测试的辅助方法。 RSpec的帮助程序包括此模块 ，因此可以在测试中使用。

describe PostController, type: :controller do
  let(:comment) { Comment.new }

  it "can post a comment thanks to Rails TestCase::Behaviour" do
    post :create, comment
    # xhr :post, ... under the covers calls for post method
  end
end

因此，示例组对象有一个称为post的方法，当您创建let时，RSpec会在该组对象上创建一个具有相同名称的方法，从而覆盖原始的（并且非常需要）post方法。

describe PostController, type: :controller do
  let(:post) { Post.new }

  it "mixes up posts" do
    post :create, post # post now refers to the variable, so this will cause an error
  end
end

为了轻松解决此问题，我建议将let(:post)命名为其他名称，例如new_post 。

describe PostController, type: :controller do
  let(:new_post) { Post.new }

  it "does not mix up posts" do
    post :create, new_post # no more conflict
  end
end