Why am I getting "Index was outside the bounds of the array" when running mstest.exe on the commandline?

Question

I am running this on my machine

"%ProgramFiles(x86)%\Microsoft Visual Studio 10.0\Common7\IDE\mstest.exe" /testcontainer:"C:\Working\Einstein\Solutions\EinsteinAcceptanceTests\bin\Debug\EinsteinAcceptanceTests.dll" /resultsfile:TestResult.trx"

And I get

index was outside the bounds of the array

message back.

Any clue on how to debug this?

Answer 1

You may check for version incompatibility. E.g. you get this error when trying to run VS2008 Tests with VS2010 mstest.exe.

Answer 2

It happened to me in VS 2012, the problem being that I had 2 unit test projects referencing to different versions of the assembly 'Microsoft.VisualStudio.QualityTools.UnitTestFramework'

I saw the problem when compiling the solution, in the output window from the test section:

------ Discover test started ------
index was outside the bounds of the array