Can't find project classes/methods in test project

Probably this is related to one of these things

1) You don't have a reference to Draughts on your unit test project

2) Classes on Draughts are not public so you can't see them outside the project they belongs to

I realize this is pretty old, but I came across this question while looking for a solution to my issue. For me it turned out that my Test project and the Tested project were on two different versions of the .NET Framework. I updated one, but forgot the other. Once I updated the test project to match the tested, everything worked like it should

Hope this helps the next person! :)