销毁操作测试用例 rspec答案

【问题标题】：Destroy action test cases rspec销毁操作测试用例 rspec
【发布时间】：2021-01-07 13:11:23
【问题描述】：

我是 rails 和 rspec 的新手 我有一个带有销毁操作的控制器

  before_action :authorize_user, only: %i[edit update destroy]

  def destroy
    @question.destroy
    respond_to do |format|
      format.html { redirect_to questions_url, notice: 'Question was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

我有一个私有方法

  def authorize_user
    redirect_to root_path if @question.user_id != current_user.id
  end

这是我写的rspec测试用例

  describe "DELETE /destroy" do
    context 'When user has signed in ' do
      let!(:user) { create(:user) }
      before do
        sign_in(user)
        
      end
      context 'User who created the question can destroy' do
        it "destroys the requested question" do
        
          expect {
            question = create(:question, user: user)
            # question.user = user
            # delete :destroy
            delete question_url(question)
          }.to change(Question, :count).by(-1)
        end
      end    
    end
  end

我遇到这样的错误

expected `Question.count` to have changed by -1, but was changed by 0

【问题讨论】：

标签： ruby-on-rails rspec rspec-rails ruby-on-rails-6 rspec3

【解决方案1】：

您不能在期望块中创建您的问题，因为这样您总共会获得 0 个计数更改（创建之前的 0，创建之前的 +1，销毁操作的 -1）。如果您将该行移到expect 块之外，我怀疑您的测试会通过。

  question = create(:question, user: user)
  expect { delete question_url(question) }.to change(Question, :count).by(-1)

【讨论】：