Thursday, December 21, 2017

TFS 2017 Build- MSTest v2 tests are not recognized

After upgrading our unit tests to MSTest v2 we noticed that our tests were no longer discovered by the VSTest task on our build agent.

As a solution, we decided to invoke the test execution ourself.

Therefore I added 2 tasks to our Build definition:

  • One command line task to execute dotnet test

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  • One task to collect and publish the test results

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In the command line task I configured the following settings:

  • To execute the dotnet command we specify ‘dotnet’ as the Tool
  • We also specify the following arguments:
    • test: we want to execute the test commando
    • --no-restore: the package restore already happened in a previous build step and shouldn’t be re-executed here
    • --no-build: assembly compilation already happened in a previous build step and shouldn’t be re-executed here
    • --logger:trx: output the test results in the trx format
  • A last important setting that we change is the ‘Continue on error’ setting is set to true. If we don’t do this, a failing test will stop any further execution of the other build steps so we never get a chance to publish the test results.

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In the publish test result task I configured the following settings:

  • Test Result Format: VSTest; Our tests are executed using MSTest and published using the VSTest format.
  • Test Results Files: **/*.trx: Search for all trx files found and publish them
  • Merge Test Results: True; Merge all test results if multiple files are found.

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After configuring these steps, we were able to succesfully run our tests and publish the results.

Remark: We are still using TFS 2017 Update 1, a newer version of the Test task exists where this problem is gone.

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