期望发现不起作用，但对find_by_id的期望是

Question

我有此控制器代码：

# GET /cardsets/1
def show
  @cardset = current_user.cardsets.find_by_id(params[:id])
end

和此RSPEC测试代码（用摩卡摩卡嘲笑）：

# GET Show
context "on get to show" do
  it "should assign cardset" do
    @cardset = Factory(:cardset)
    @profile = @cardset.profile

    @profile.cardsets.expects(:find).once.returns(@cardset)
    get :show, :id => @cardset.id
    assigns[:cardset].should_not be_nil
  end
end

该测试失败了：

2)
Mocha::ExpectationError in 'CardsetsController for a logged in user on get to show should assign cardset'
not all expectations were satisfied
unsatisfied expectations:
- expected exactly once, not yet invoked: [#<Cardset:0x1032bb660>].find(any_parameters)
satisfied expectations:
- allowed any number of times, not yet invoked: ApplicationController.require_user(any_parameters)
- allowed any number of times, already invoked twice:     #<CardsetsController:0x10336c578>.current_user(any_parameters)

如果我改变了期望：

@profile.cardsets.expects(:find_by_id).once.returns(@cardset)

然后测试通过了，为什么会通过find_by_id且找不到找到？

Answer 1

我认为这是因为 find 和 find_by_id 实际上是不同的消息。您的控制器使用 find_by_id, ，但是您正在设置消息期望 find.