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Usually skipped testcase output "SKIPPED" [snip serial execution] |RESULTS - buildgalculator.GalculatorTest.test_galculator - Testcase -1: SKIPPED (0.01s) |RESULTS - python.PythonTest.test_python3 - Testcase -1: SKIPPED (0.01s) [snip serial execution] But if enable multiprocess execution, skipped testcase output "UNKNOWN" status [snip enable multiprocess execution] |RESULTS - buildgalculator.GalculatorTest.test_galculator - Testcase -1: UNKNOWN |RESULTS - python.PythonTest.test_python3 - Testcase -1: UNKNOWN [snip enable multiprocess execution] Here is my investigation: There is a class pairs TestProtocolClient and TestProtocolServer provided by python3-subunit. The TestProtocolClient generates a subunit stream of TestResult from a test run, and TestProtocolServer parses the stream of subunit TestResult. The class ProtocolTestCase is a unittest.TestCase adapter and it uses TestProtocolServer to parse the stream of subunit TestResult. In Yocto testsdk, it forks multiple processes to execute testcases and use TestProtocolClient to generate TestResult stream; and then it creates multiple threads to use ProtocolTestCase to parse stream of subunit TestResult through pipe; finally it passes multiple ProtocolTestCase as TestCase instance to main process and output status result. The problem point is TestProtocolServer parses `skip:' directive after reading a `test:' directive. Without `test:' directive, `skip:' directive will be ignored. All above requires SkipTest should be raised inside a test method rather than setUpClass method. Throwing SkipTest inside setUp works correctly (From OE-Core rev: 4828a88556d59e4d06933164c2ebeb9361b7450e) Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>