ruby-on-rails - rspec 中的 rails 命名空间 Controller 测试

Question

我的规范一般工作正常，但是当我尝试测试我的嵌套 Controller 时，我收到一个奇怪的错误。所以这个码型subject(:create_action) { xhr :post, :create, post_id: post.id, post_comment: attributes_for(:post_comment, post_id: post.id, user: @user) }与我的非嵌套 Controller 一起工作正常，但对于我的命名空间 Controller ，测试 it "saves the new task in the db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？如你所见，我把我的 post_comments_controller_spec.rb在 specs/controllers/posts文件夹并需要 posts/post_comments_controller ，但这没有帮助。

路由文件

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

规范/ Controller /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，您的 let!(:post) { ... }最终覆盖了一个名为 post 的方法在用于发出发布请求的示例组上。

发生这种情况是因为当您定义 let 时内describe , RSpec defines you a method given example group 内的同名.

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

  it "does something" do
    post.do_something
  end
end

xhr method (以及 get 、 post 等)，另一方面是用于从 Rails 本身进行测试的辅助方法。 RSpec includes this module与助手一起使用，以便它在测试中可用。

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

所以示例组对象有一个名为 post 的方法，当您创建 let 时，RSpec 会在组对象上创建一个同名的方法，从而覆盖原始(并且非常需要)的 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

为了轻松解决这个问题，我建议将 let(:post) 命名为到别的东西，比如 new_post例如。

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