Object argument to mock EXPECT_CALL

Question

I have a simple mock class:

class MockCanInterface : public lib::CanInterface {
 public:
  MockCanInterface() : CanInterface({"mock"}) {}

  MOCK_METHOD1(Write, bool(const lib::CanFrame& frame));
  MOCK_METHOD1(Read, bool(lib::CanFrame* frame));
};

In the test code I want to pass an object to the Write method. Is there a way to do this with .With clause? It works with passing argument directly, but now with .With. The code compiles, but fails during execution - the size of the object is correct, but the data isn't.

This works:

EXPECT_CALL(can_, Write(expected_command_))
        .WillOnce(Return(true));

This doesn't:

EXPECT_CALL(can_, Write(_))
        .With(Args<0>(expected_command_))
        .WillOnce(Return(true));

I admit that there may be something missing in the way the code sets the expected object.

Answer 1

I think the point is: The method Write() required a CanFrame argument passed by reference.

I suggest to use the Actions provided by GMock:
SetArgReferee - reference or value
SetArgPointee - pointer

You can find examples and much more here

However this solution works for me, I hope for you too ;)

EXPECT_CALL(can_, Write(_))
        .WillOnce(SetArgReferee<0>(expected_command_));

or with the return value:

EXPECT_CALL(can_, Write(_))
        .WillOnce(DoAll(SetArgReferee<0>(expected_command_), Return(true)));