Made mock modifiers inheritable

[AKJ7]

Motivation

For large codebases, it can be very annoying to define Mocks:

class MockFoo {
 public:
  MOCK_METHOD((std::pair<bool, int>), GetPair, ());
  MOCK_METHOD(bool, CheckMap, ((std::map<int, double>), bool));
};

Using such mocks will create Uninteresting Mock functions warnings when any of the mock methods are used.
Possible solutions include implementing EXPECT_CALL for each and every mock methods of this class. This can be very teadious and unnecessary when an actual implementation of the mock methods are not needed.

Alternatively, the NiceMock modifier can be used. This can however create very repetative code (Yes, i know #defines and usings can be used), it would be nice if the modifiers can directly be applied directly to the class definition as so:

class MockFoo: public ::testing::NiceMockable<MockFoo> {
 public:
  MOCK_METHOD((std::pair<bool, int>), GetPair, ());
  MOCK_METHOD(bool, CheckMap, ((std::map<int, double>), bool));
};

This feature is implementated in this pull request and i would be happy if this code can be reviewed and merged.

Do i need to update the gtest/gmock docs?

Thanks.

• Mock object can be made Strict/Nice/Naggy by inheritance

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