Issue 35458: test_shutil.test_disk_usage() randomly fails when tests are run in parallel (original) (raw)

Extract of the test:

    usage = shutil.disk_usage(os.path.dirname(__file__))
    self.assertEqual(usage, shutil.disk_usage(__file__))

The test fails if another process creates or removes data on the disk partition. IMHO "self.assertEqual(usage, shutil.disk_usage(file))" must be removed, it cannot be reliable without mocking os.statvfs() / nt._getdiskusage().

Even if tests are run sequentially, the test can fail if a program creates a file between the two lines of code, the test cannot be reliable.

https://buildbot.python.org/all/#/builders/85/builds/1882

FAIL: test_disk_usage (test.test_shutil.TestShutil)

Traceback (most recent call last): File "/home/shager/cpython-buildarea/3.x.edelsohn-fedora-ppc64le/build/Lib/test/test_shutil.py", line 1366, in test_disk_usage self.assertEqual(usage, shutil.disk_usage(file)) AssertionError: usage(total=1925696024576, used=1793793806336, free=131902218240) != usage(total=1925696024576, used=1793793818624, free=131902205952)