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bpo-15010, unittest: _top_level_dir is incorrectly persisted #15242



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commented Aug 13, 2019

bpo-15010, unittest: _top_level_dir is incorrectly persisted
Co-Authored-By: Igor Sobreira <>
sys.path[:] = original_sys_path

os.path.isfile = lambda path: True

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tirkarthi Aug 13, 2019


Is unittest.mock.patch a better option here instead of addCleanup?

def test_discover_should_not_persist_top_level_dir_between_calls(self):
    with unittest.mock.patch('os.path.isfile', return_value=True):
        with unittest.mock.patch('os.path.isdir', return_value=True):
            loader = unittest.TestLoader()
            loader.suiteClass = str
            dir = '/foo/bar'
            top_level_dir = '/foo'

  , top_level_dir=top_level_dir)
            self.assertEqual(loader._top_level_dir, None)

            loader._top_level_dir = dir2 = '/previous/dir'
  , top_level_dir=top_level_dir)
            self.assertEqual(loader._top_level_dir, dir2)
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