How can I add a .cpp to Visual Studio .Net that I do not want compiled
in a build?

I have a C++ project, and I want to have some unit test classes in the
project. However, I do not want them compiled in VS because I haven't
gotten cppunit configured for VS. Hence, I would only get errors when
I compile.I am using a makefile to compile the unit tests separately.

However, I would still like to use Intellisense in VS for editing the
unit test classes.

Is this even possible?

Thanks.