我可以使用谷歌模拟检查方法参数而无需提前设定预期吗？(Can I use google mocks to check method parameters without setting an expectation in advance?)

我可以使用谷歌模拟检查方法参数而无需提前设定预期吗？(Can I use google mocks to check method parameters without setting an expectation in advance?)

我有一种情况，我想检查是否使用参数X调用模拟对象方法，但测试只有在调用模拟后才能访问X，所以我不能事先设置EXPECT_CALL。

例如

// The class I'm testing. class Maker { void register(Listener& lis); Obj& make() { // make new Obj o // call created(o) on registered Listener // return o } } class Listener { virtual void created(Obj& o) = 0; } // The test Listener lis; Maker maker; maker.register(lis); Obj& o = (); // Check that lis was invoked using param o...how?

我可以用谷歌嘲笑吗？ 使用谷歌模拟最优雅/可读的方式是什么？

显然我可以创建自己的MockListener来记录调用参数，而不是使用谷歌模拟。 但我希望google mocks会提供一种更易读的机制，类似于EXPECT_CALL。

I have a situation where I want to check if a mock object method was called with parameter X, but the test gets access to X only after the mock is invoked, so I can't set an EXPECT_CALL beforehand.

E.g.

// The class I'm testing. class Maker { void register(Listener& lis); Obj& make() { // make new Obj o // call created(o) on registered Listener // return o } } class Listener { virtual void created(Obj& o) = 0; } // The test Listener lis; Maker maker; maker.register(lis); Obj& o = (); // Check that lis was invoked using param o...how?

Can i do this with google mocks? What is the most elegant / readable way of doing this using google mocks?

Obviously I can make my own MockListener which will record invocation parameters, instead of using google mocks. But I'm hoping google mocks would preesnt a more readable mechanism, similar to EXPECT_CALL.

最满意答案

您可以使用SaveArg<>操作来保存调用Listener::created(Obj&)的参数值，这样您就可以将其值与()之后返回的值进行比较。

这将要求您为类Obj提供相等运算符，即bool operator==(ct Obj&, ct Obj&) 。

您的测试可能如下所示：

class ListenerMock : public Listener { public: MOCK_METHOD1(created, void(Obj&)); }; TEST(MakerTest, make_registersObject) { ListenerMock lis; Maker maker; maker.register(lis); Obj createdArg; EXPECT_CALL(lis, created(_)) .Times(1) .WillOnce(SaveArg<0>(&createdArg)); Obj& o = (); ASSERT_EQ(createdArg, o); }

You can use the SaveArg<> action to save the value of the parameter with which Listener::created(Obj&) is called, so you can compare its value to the one returned by () afterwards.

This will require that you provide equality operator for class Obj, bool operator==(ct Obj&, ct Obj&).

Your test could then look like this:

class ListenerMock : public Listener { public: MOCK_METHOD1(created, void(Obj&)); }; TEST(MakerTest, make_registersObject) { ListenerMock lis; Maker maker; maker.register(lis); Obj createdArg; EXPECT_CALL(lis, created(_)) .Times(1) .WillOnce(SaveArg<0>(&createdArg)); Obj& o = (); ASSERT_EQ(createdArg, o); }