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I'm trying to understand the purpose of google-mock, Google's C++ mocking framework.
I have already worked with gtest earlier, but still I can't understand what gmock is. Why do we need it?
gtest is used for unit testing. What do we need gmock for then, if gmock is required for unit testing?
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GoogleMock is a part of GoogleTest C++ testing framework and a subject to the same requirements.
Google Test (also known as gtest) is a unit testing library for the C++ programming language, based on the xUnit architecture. The library is released under the BSD 3-clause license.
Mocking Private or Protected Methods You must always put a mock method definition ( MOCK_METHOD ) in a public: section of the mock class, regardless of the method being mocked being public , protected , or private in the base class.
GTest is objected oriented tool and C language isn't! from GTest website gmock_for_dummies.md so you will use only macros like expect_equal, expect_bigger_than and so on... I would like to suggest you tool CMocka (or some other C unit testing tools).
"Google Mock is not a testing framework itself. Instead, it needs a testing framework for writing tests. Google Mock works seamlessly with Google Test. It comes with a copy of Google Test bundled. Starting with version 1.1.0, you can also use it with any C++ testing framework of your choice. " - Google Mock, System Requirements
Mock are like objects, defined in such a way to mimick the real-deal by supplying controlled behavior. For instance, to test a stock tick application, you'd create a fake stock data provider that created fake stock quotes to test your code with. Think of the word mock, literally means 'to mimic'.
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Software units do not live in green meadows. They very often need some counterparts to do the work. In real system, these counterparts belong to the system itself. In the unit tests they are replaced with mocks.
Gtest is a framework for unit testing. Gmock is a framework imitating the rest of your system during unit tests.
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