GoogleMock adding a default action to increment a counter using lambdas.

on_call_with_lambdas.cpp

#include <gmock/gmock.h>
using namespace testing;


struct SomeStruct {
    virtual void apply() {
        // do nothing
    }
};

struct MockStruct : public SomeStruct {
    MOCK_METHOD0(apply,void());
};

void func(SomeStruct& s) {
    s.apply();
}

TEST(StructTest, do_your_magic) {
    MockStruct mock;
    int callCounter = 0;
    ON_CALL(mock,apply())
            .WillByDefault(InvokeWithoutArgs([&callCounter](){
                callCounter++;
            }));
    func(mock);
    ASSERT_THAT(callCounter,Eq(1));
}

int main(int argc, char**argv) {
    ::testing::InitGoogleMock(&argc,argv);
    return RUN_ALL_TESTS();
}