MSUnit toolbar does not work or is grayed out

If you have a library with MSUnit tests in it (probably because you converted MBUnit or NUnit tests to MSUnit tests) and the MSUnit toolbar will not work (stays grayed out), you are probably missing the ProjectTypeGuids. The line your missing from the library project file in the top most PropertyGroup is this one:

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

The line above identifies the project as a test project ({3AC096D0-A1C2-E12C-1390-A8335801FDAB}) in the C# ({FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}) language.

Reference that I found after the fact:

• http://www.mokesit.com/Blogs/tabid/89/EntryID/11/Default.aspx
• http://blogs.infosupport.com/blogs/raimondb/archive/2005/05/03/Converting-a-NUnit-project-to-Microsoft-UnitTest-project.aspx
• http://onlinecoder.blogspot.com/2009/09/visual-studio-projects-project-type.html