Have you ever created a class library project, started to write some unit tests and realize you did not use the VS2005 UnitTest Project Template to create your project.

I have done this countless times, left over habits from NUnit days I guess.

So, using notepad, I popped open a csproj file the I created using the correct VS2005 Project Template for unit testing.  I found a key called ProjectTypeGuids.  Using notepad again, I opened my class library project and did not find a key called ProjectTypeGuids.  So, I put the following key in my project, and what do you know it worked!!!!

I think the guids are different for VB.NET and C# project templates.  So if  you are using VB.NET, you may have to lookup the appropriate guids.

    {3AC096D0-A1C2-E12C-1390-A8335801FDAB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}