Error running unit tests after upgrading to TFS 2015 v3

Question

I have unit tests that get executed as part of my TFS 2015 build (created using the native Microsoft.VisualStudio.TestTools.UnitTesting assembly).

Everything worked fine. I upgraded TFS this morning to TFS 2015 v3. The upgrade went perfectly and no errors were encountered.

Running a subsequent build and the unit tests are no longer getting executed. I run these using a Visual Studio Test build step.

Looking into the build logs I have found that there are subtly different commands being executed for vstest.console.exe.

A working command (from yesterday before the upgrade)

vstest.console.exe
"E:\TfsData\Build\_work\DEV\CoreLibraryTests\bin\Release\CoreLibraryTests.dll"  
/Settings:"E:\TfsData\Build\_work\DEV\CoreLibraryTests\CoreLibraryTests.runsettings" 
/logger:trx

And here's one from today (that fails)

vstest.console.exe 
"$/DEV/CoreLibraryTests/bin/Release/CoreLibraryTests.dll"  
/Settings:"E:\TfsData\Build\_work\DEV\CoreLibraryTests\CoreLibraryTests.runsettings" 
/logger:trx

In the failing build step the path "$/DEV/CoreLibraryTests/bin/Release/CoreLibraryTests.dll" has not been resolved to a physical path on disk (which it did previously - see working command).

This was all working and I can't understand why it's now failing. Any ideas how this can be fixed?

Answer 1

You need to update the build agent in Agent Pools which you are using and try again.

If this still not work, try to create a new build definition with the same settings as a workaround. The issue should go away.

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Update

How to update build agent

Open your web portal (such as http://your server:8080/tfs)-open the control panel (click account settings icon on the top right corner)- select agent pools -right click the agent pool you are using and select update all agents.

How to check the workspace mappings

Open Visual Studio- Click the Triangle symbol beside your workspace - In the pop up Manage workspace window select edit - double check the mapping relationships between source control folder and local folder should still exist.