Try modifying the file C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplatesCache\CSharp\1033\SimpleUnitTest.zip\SimpleUnitTest.cs
(after making a backup, of course). Keep a copy of your updated version elsewhere as this may get overwritten by updates.
FWIW -- I found this by searching for the string using Microsoft.VisualStudio.TestTools.UnitTesting;
inside files starting at the top level directory of the VS application directory.
tvanfosson
2009-04-02 17:52:54