CODEWITHSUNDEEP
c++c++17googlemock
ruipacheco
ruipacheco

Reputation: 16412

Using Google Mock with pointer to interface

I have the following interface:

struct IBackgroundModel {
    virtual Image process(const Image& inputImage) = 0;
    virtual ~IBackgroundModel() = default;
};

and a test with a mock:

TEST_F(EnvFixture, INCOMPLETE) {
        struct BackgroundModelMock : IBackgroundModel {
            MOCK_METHOD1(process, Image(const Image& override));
        };
        std::unique_ptr<IBackgroundModel> model = std::make_unique<BackgroundModelMock>();
        Image input;
        Image output;
        EXPECT_CALL(model, process(input)).Will(Return(output));


        BackgroundModelFactory factory;
        factory.set(model.get());
        const auto result = factory.process(input);
    }

But I can't compile nor figure out what the error means:

error C2039: 'gmock_process': is not a member of 'std::unique_ptr<P,std::default_delete<P>>'
        with
        [
            P=kv::backgroundmodel::IBackgroundModel
        ]
C:\Source\Kiwi\Kiwi.CoreBasedAnalysis\Libraries\Core\Kiwi.Vision.Core.Native\include\Ptr.hpp(17): message : see declaration of 'std::unique_ptr<P,std::default_delete<P>>'
        with
        [
            P=kv::backgroundmodel::IBackgroundModel
        ]

Upvotes: 1

Views: 685

Answers (1)

bartop
bartop

Reputation: 10315

Firstly EXPECT_CALL takes reference, not a (smart) pointer. Secondly, it has to be reference to the concrete mock, not to the mocked class/interface. And thirdly, in latest gtest there is no Will funciton. There is WillOnce and WillRepeadately. So the fix is like this:

std::unique_ptr<BackgroundModelMock> model = std::make_unique<BackgroundModelMock>();
Image input;
Image output;
EXPECT_CALL(*model, process(input)).WillOnce(testing::Return(output));

Upvotes: 3

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