Rspec:如何对私有方法进行存根?

| 这是错误:
private method `desc\' called for #<Array:0x0000010532e280>
规格:
describe SubjectsController do  
  before(:each) do
    @subject = mock_model(Subject)
  end

    describe \"#0002 - GET #index\" do
    before(:each) do        
      subjects = [@subject, mock_model(Subject), mock_model(Subject)]
      Subject.stub!(:all).and_return(subjects)
      Subject.all.stub!(:desc).and_return(subjects)
      get :index
    end

    it { response.should be_success }
    it { response.should render_template(\"index\") }
  end
end
和控制器:
def index
  @subjects = Subject.all(conditions: {company_id: current_user.company.id}).desc(:created_at)
end
我不知道如何解决这个问题,有人可以帮我吗? 您还可以就如何测试此方法提供建议吗? 谢谢。     
已邀请:
        它比我更喜欢模拟和链接,但是,您可以执行以下操作:
subjects = [...]
desc_mock = double(\"desc order mock\")
desc_mock.should_receive(:desc).with(:created_at).and_return(subjects)

conditions = {...}
Subject.should_receive(:all).with(conditions).and_return(desc_mock)
您还可以通过将查询移到带有某些参数的命名范围来简化此操作。然后您的测试可以验证Subject是否使用正确的参数接收了您的范围,例如:
Subject.should_receive(:user_company).with(current_user.id).and_return(subjects)
    
        stub_chain应该在这里工作:
  Subject.stub_chain(:all,:desc) { [mock_model(Subject)]*2 }
    

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