Running VS2012 unit tests from TFS2010 Team Build

Running VS2012 unit tests from TFS2010 Team Build

I have a Visual Studio 2012 solution using .NET 4.5 framework. The rest of
our development system is TFS2010. Recently some of our unit tests have
been failing on the build server only. After going through several rounds
of debugging I was able to determine that the cause of the failed tests
was most likely due to the version of MSTest being used on the build
server. The tests in question pass when run from VS2012 on my local
machine and when run from VS2012 on the actual build server.
I have followed the steps described in the following articles (I have not
found any useful articles directly relevant to VS2012 and TFS2010) without
success: Running VS2010 UnitTests project from TFS2008 Team Build and
VS2010, TFS 2008 and Unit Tests
On the build server I now have the following:
VS2010 Ultimate SP1 installed
VS2012 Update 3 installed
.NET 4.5 framework SDK installed
Changed Microsoft.TeamFoundation.Build.targets file in "C:\Program Files
(86)\MSBuild\Microsoft\VisualStudio\TeamBuild\" and "C:\Program
Files\MSBuild\Microsoft\VisualStudio\TeamBuild\" so the AssemblyFile
attribute of the TestToolsTask build task pointed to "C:\Program Files
(x86)\Microsoft Visual Studio
11.0\Common7\IDE\PrivateAssemblies\Microsoft.TeamFoundation.Build.ProcessComponents.dll"
I have 2 build definitions that I have been testing with:
In the first build definition I have left the ToolPath of the "run MS
Test" activity blank so it then uses "C:\Program Files (x86)\Microsoft
Visual Studio 10.0\Common7\IDE"
In the other build definition I have changed the "Run MS Test" activity
ToolPath parameter to "C:\Program Files (x86)\Microsoft Visual Studio
11.0\Common7\IDE"
Both build definitions appear to be building correctly and are using the
following MSBuild.exe:
C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
The first build defintion runs the VS2010 version of MStest with any
errors, but 5 of the approx. 2030 tests fail. These tests do not fail when
run from within Visual Studaio 2012. An example of the command line is
(actual paths and server names removed):
C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\MSTest.exe
/nologo /usestderr /searchpathroot:"d:\Builds\xxxxx\Binaries"
/resultsfileroot:"d:\Builds\xxxxx\TestResults"
/testcontainer:"d:\Builds\xxxxx.dll"
/testcontainer:"d:\Builds\xxxxx.dll" /publish:"http://xxxxx
/publishbuild:"vstfs:///Build/Build/xxxxx" /teamproject:"xxxxx"
/platform:"x86" /flavor:"Debug"
When running the second build definition MSTest fails to run with the
output below. If I run this command from the command line on the build
server without the switches that are causing the Invalid switch error then
MSTest runs and the tests in question are passed:
The MSTestActivity was invoked without a value for Platform or Flavor. The
values x86 and Debug were used.
C:\Program Files (x86)\Microsoft Visual Studio
11.0\Common7\IDE\MSTest.exe
/nologo /usestderr /searchpathroot:"d:\Builds\xxxxx\Binaries"
/resultsfileroot:"d:\Builds\xxxxx\TestResults"
/testcontainer:"d:\Builds\xxxxx.dll"
/publish:"http://xxxxx" /publishbuild:"vstfs:///Build/Build/xxxxx"
/teamproject:"xxxxx"
/platform:"x86" /flavor:"Debug"
Invalid switch "/publish".
Invalid switch "/publishbuild".
Invalid switch "/teamproject".
Invalid switch "/platform".
Invalid switch "/flavor".
For switch syntax, type "MSTest /help"
I have done a lot of runs of these builds but I hvae not been able to
resolve the problem. Is there anything else that I am missing that needs
to be done either on the build server or in the build definition?
In relation to the actual tests that are failing they have in common that
they are comparing objects in lists, but as mentioned they pass when run
from within VS2012.