Test run errors with MSTest in VS2010

Question

When I run my Unit Tests, all tests pass, but instead of \"Test run succeeded\" or whatever the success message is, I get \"Test run error\" in the little bar that tells me

Answer 1

First of all - you have Code Coverage enabled. You can read here about it. So there is no problems with Unit Tests. This is code coverage problem.

Second thing - this warning is ok - never mind about it.

Third thing - this error - this is the key problem.

There can be different problems - most common is that you should refference more assemblies. To find out what exactly should be loaded you must go to Event Viewer and look at at Windows Logs->Application

Answer 2

I had the same error related to MS-Test complaining that a DLL could "override deployment item blah.dll".

This was happening because I was running MS-Test for multiple DLL's at once like so:

mstest.exe /testcontainer:Tests.web.dll /testcontainer:Tests.svcs.dll /testcontainer:Tests.core.dll

When MS-Test was running this, it tried to take all the output DLL's from the tests and place them in out /Out directory of the test run. In my case, Tests.svcs.dll and Tests.core.dll both referenced the same assembly (Core.dll) and therefore it tried to copy that DLL to the same spot twice (thus causing the warning).

To resolve this, I separated the test runs for each assembly which gave each test run it's own /Out folder for output DLL's

mstest.exe /testcontainer:Tests.web.dll

mstest.exe /testcontainer:Tests.svcs.dll

mstest.exe /testcontainer:Tests.core.dll