Unit-testing functions with user-defined types

[terminalXXX]

Thank you, the only weird thing is I could not find any tutorials or example code to do what you suggested me. Are there any underlying claims for *never* mocking user-defined, COM related functions ? Because if this is a must-do thing in unit tests, there should be questions or source code I could google out.

Would you mind providing me a wrapper class you have dealt with to unit-test any COM functions or those with COM related arguments ?

I can only do simple things like this

for a function

int foo(int i, char c){...;return 1;}

then my test method is

TEST_METHOD(foo)
{
      MyCls cls;
      Assert::AreEqual(1,cls.foo(1,'1'));
}