Create COM unit tests based on CoCreateInstance() function.

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Is your feature request related to a problem? Please describe.
The application has unit test for the shell extension's entry point. These tests connects to the dll directly using LoadLibrary(), FreeLibrary() and GetProcAddress() to test the expected behavior's of the shell extension entry points.

For stronger reliability, test that forces the library to be loaded as a COM object should also be added. That is, the library should be loaded through CoCreateInstance() function.

Describe the solution you'd like
Refer to https://stackoverflow.com/questions/43010172/addref-and-release-in-iunknown-what-do-they-actually-do for examples of code that is able to instantiate the library.

Describe alternatives you've considered
N/A

Additional context
N/A