InternalsVisibleTo attribute isn't working

Question

I am trying to use the InternalsVisibleTo assembly attribute to make my internal classes in a .NET class library visible to my unit test project. For some reas

Answer 1

If you have more than 1 referenced assembly - check that all necessary assemblies have InternalsVisibleTo attribute. Sometimes it's not obviously, and no message that you have to add this attribute into else one assembly.