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I found this with Dev 200902090201 and verified it with main-golden. Test classes, which reside in test roots, are not found by the Python Test Runner, as the test root directories are not added to the Python Path. The attached patch solves the problem and adds a logging statement allowing to see such issues without having to look into the source code in the future.
Created attachment 77058 [details] Patch solving the issue
Thanks for the patch -- applied as changeset f8c0c31eae67.