title: Visual c++ "doesn't see" sources .cpp file in unit tests
body: <p>I have a unit test C++ project, and it compiles and runs without issues if all code is in header file. However, when I declare one property as static and take it's initialization to the .cpp file (with the same name), I get:</p>
  
  <p>error LNK2001: unresolved external symbol: public static class...</p>
  
  <p>Any suggestions how to ensure visual studio finds and compiles .cpp file? They are both in the same directory and this directory in the include list.</p>