fake/mock nonvirtual C++ methods

Question

It known that in C++ mocking/faking nonvirtual methods for testing is hard. For example, cookbook of googlemock has two suggestion - both mean to modify original source code

Answer 1

@zaharpopov you can use Typemock IsolatorPP to create mocks of non-virtual class and methods without changing your code (or legacy code). for example if you have a non-virtual class called MyClass:

class MyClass
{
 public:
   int GetResult() { return -1; }
}

you can mock it with typemock like so:

MyClass* fakeMyClass = FAKE();
WHEN_CALLED(fakeMyClass->GetResult()).Return(10);

By the way the classes or methods that you want to test can also be private as typemock can mock them too, for example:

class MyClass
{
private:
   int PrivateMethod() { return -1; }
}


MyClass* myClass =  new MyClass();

PRIVATE_WHEN_CALLED(myClass, PrivateMethod).Return(1);

for more information go here.