EXPECT_CALL(...).WillOnce(...) not working with InvokeArgument and SetArgReferee

[AeroSW]

Setup

OS: Windows 11 x64
Compiler: G++ 14.1
Standard: C++23

Additional Libraries used in setting up unit tests.

• JoMock (Github page)
  • A mocking library that allows static, global (legacy), and non-virtual polymorphic mocking.

Other information for code below:

• SDL_Vulkan_GetInstanceExtensions Documentation

Example Code

InvokeArgument

Code

    void testFunc(SDL_Window* window, ui32 * cc, const char** str_matrix) {

    }
    void setupVulkanMocks() {
        auto sdl_vulkan_instanceextensions_mock = &JOMOCK(SDL_Vulkan_GetInstanceExtensions);
        EXPECT_CALL(*sdl_vulkan_instanceextensions_mock, JOMOCK_FUNC(_, _, _))
            .WillOnce(InvokeArgument<3>(testFunc));
    }

Error

no instance of overloaded function "testing::internal::TypedExpectation<R (Args...)>::WillOnce [with R=SDL_bool, Args=<SDL_Window *, unsigned int *, const char **>]" matches the argument listC/C++(304)
renderer.mock.cpp(15, 14): argument types are: (testing::internal::InvokeArgumentAction<3ULL, void (*)(SDL_Window *window, CzaraEngine::ui32 *cc, const char **str_matrix)>)
renderer.mock.cpp(15, 14): object type is: testing::internal::TypedExpectation<SDL_bool (SDL_Window *, unsigned int *, const char **)>
WillOnce
+2 overloads

Preferred, type-safe overload: consume anything that can be directly
converted to a OnceAction, except for Action<F> objects themselves.

Looking at the examples in GMOCK's Cookbook, it appears that the above should work with no error.

SetArgReferee

Code

    void setupVulkanMocks() {
        ui32 v = 5;
        auto sdl_vulkan_instanceextensions_mock = &JOMOCK(SDL_Vulkan_GetInstanceExtensions);
        EXPECT_CALL(*sdl_vulkan_instanceextensions_mock, JOMOCK_FUNC(_, _, _))
            .WillOnce(SetArgReferee<1>(v));
    }

Error

no instance of overloaded function "testing::internal::TypedExpectation<R (Args...)>::WillOnce [with R=SDL_bool, Args=<SDL_Window *, unsigned int *, const char **>]" matches the argument listC/C++(304)
renderer.mock.cpp(16, 14): argument types are: (testing::internal::SetArgRefereeAction<1ULL, unsigned int>)
renderer.mock.cpp(16, 14): object type is: testing::internal::TypedExpectation<SDL_bool (SDL_Window *, unsigned int *, const char **)>
WillOnce
+2 overloads

Preferred, type-safe overload: consume anything that can be directly
converted to a OnceAction, except for Action<F> objects themselves.

There is no example of how to appropriate utilize SetArgReferee in the Cookbook, but I found something on StackOverflow that has usage of the method in WillOnce.

---

It feels like I might be missing something, so I would appreciate the observations and help!

[AeroSW]

So the answer to my post is relatively simple. I blame my short-sightedness behind not connecting how to use DoAll correctly and realizing that, since, the function isn't void, it's usage of .Will... requires it to have a mocked return as well.

        ui32 v = 5;
        EXPECT_CALL(*sdl_vulkan_instanceextensions_mock, JOMOCK_FUNC(_, _, _))
            .WillOnce(DoAll(SetArgReferee<1>(v), Return(SDL_TRUE)))
            .WillRepeatedly(DoAll(SetArgReferee<1>(v), Return(SDL_TRUE)));