[Python-Dev] Regression test coupling (original) (raw)
Vinay Sajip vinay_sajip at yahoo.co.uk
Tue Nov 8 11:02:14 CET 2011
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I ran into an error today related to the use of support.TESTFN throughout the regression test suite. In my Windows tests, test_base64 passed, but left a file (named by support.TESTFN) lying around:
'test_base64' left behind file '@test_3532_tmp'
Much later in the run, a set of unrelated tests started failing, all apparently because of the left-behind file - for example, test_mailbox.setUp failed while trying to make a directory named by support.TESTFN:
File "c:\Users\Vinay\Projects\pythonv\lib\mailbox.py", line 270, in init os.mkdir(self._path, 0o700) PermissionError: [Error 5] Access is denied: 'c:\Users\Vinay\Projects\pythonv\build\test_python_3532\@test_3532_tmp'
Sorry if this has come up before, but why do we couple the tests in this way, so that failure to clean up in one test causes drive-by failures in other, unrelated tests?
Regards,
Vinay Sajip
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