RSpec 控制器销毁测试

Question

我正在构建一个允许用户 create/delete post 的测试应用程序。我发现我发现很难调试的销毁操作中有一个错误。这是我的测试：

  describe '#destroy' do
    context 'existing post' do
      let (:post) { FactoryGirl.create(:post) }

      it 'removes post from table' do
        expect { delete :destroy, id: post }.to change { Post.count }.by(-1)
      end

      it 'renders index template' do
        delete :destroy, id: post
        expect(response).to render_template('index')
      end
    end

    context 'delete a non-existent post' do
      it 'creates an error message' do
        delete :destroy, id: 10000
        expect(flash[:errors]).to include("Post doesn't exist")
      end
    end
  end

这是我的销毁动作：

  def destroy
    @post = Post.find_by(id: params[:id])
    if @post
      @post.destroy
    else
      flash[:errors] = "Post doesn't exist"
    end
    render :index
  end

我在操作中放置了一个调试器，看起来 post 已找到并正确删除，所以我怀疑问题出在我评估测试的方式上。这是我失败的规范：

  1) PostsController#destroy existing post removes post from table
     Failure/Error: expect { delete :destroy, id: post }.to change { Post.count }.by(-1)
       expected result to have changed by -1, but was changed by 0

这是怎么回事？

Answer 1

我认为您的 post 已创建，但在评估第一个计数之后。让我们确保它是在 let!

之前创建的

let!(:post) { FactoryGirl.create(:post) }

RSpec 控制器销毁测试

RSpec Controller Destroy Testing

ruby

rspec

ruby-on-rails

factory-bot