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We use TFS 2010 and Automated builds. We also make use of MSTests.
I would like some concrete information about the build server's test execution method. Will the test engine (on build server) run the unit tests sequentially or in parallel?
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Unit tests run one at a time. There is no parallelism. See attached screenshot. We have directed your feedback to the appropriate engineering team for further evaluation.
To run all the tests in a default group, choose the Run icon and then choose the group on the menu. Select the individual tests that you want to run, open the right-click menu for a selected test and then choose Run Selected Tests (or press Ctrl + R, T).
By default it will run them sequentially. You can customize the build workflow by adding a Parallel activity and running different sets of tests in each. Or if you want to parallelize the test run across multiple build machines you can have the build use multiple RunOnAgent activities to do so (http://blogs.msdn.com/b/jimlamb/archive/2010/09/14/parallelized-builds-with-tfs2010.aspx).
Note: If you execute the tests across multiple test runs you will end up with multiple test reports (.trx files) that will not be merged together without further customization of the build.
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