I get this error when running my Moq tests through Teamcity 5
Test(s) failed. System.IO.FileNotFoundException : Could not load file or assembly \'
I had a similar issue, but found that I had different version's of Moq between my 2 Test projects.
The issue that I had was that the correct version was not available.
Just do
Update-Package Moq
From the Package Manager command line
So the issue was to do with the Test DLL search path under the nunit settings
It was:
..\Tests\**\*Test*.dll
But is now:
..\Tests\*\bin\Debug\*Test*.dll
And things work nicely
UPDATE
http://confluence.jetbrains.com/display/TCD8/NUnit
You can use this pattern
**\*.dll
as long as you add this pattern in the "Do not run tests from" field
**\obj\**\*.dll