bpo-39986: Make test_listdir from test_os more robust #19035
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The test_listdir test of test_os assumed that calling listdir on the root directory twice gives the same results, however this can fail if unrelated process create files in the root directory in between the two calls. This changes the test to create a temporary directory with two files inside and call listdir on this temporary directory instead.
iritkatriel
reviewed
Jan 15, 2022
| with tempfile.TemporaryDirectory() as tmpdir: | ||
| os.chdir(tmpdir) | ||
| open("a.txt", "w").close() | ||
| open("test_file.foo", "w").close() |
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Can you write something in the files just to make sure they are created on all platforms?
| os.chdir(tmpdir) | ||
| open("a.txt", "w").close() | ||
| open("test_file.foo", "w").close() | ||
| self.assertEqual(set(os.listdir()), set(os.listdir(tmpdir))) |
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Would it make sense to check that the file you created are in the output?
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| with tempfile.TemporaryDirectory() as tmpdir: | ||
| os.chdir(tmpdir) | ||
| open("a.txt", "w").close() | ||
| open("test_file.foo", "w").close() | ||
| self.assertEqual(set(os.listdir()), set(os.listdir(tmpdir))) |
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There is already a directory with a known content: self.dir.
Suggested change
| with tempfile.TemporaryDirectory() as tmpdir: | |
| os.chdir(tmpdir) | |
| open("a.txt", "w").close() | |
| open("test_file.foo", "w").close() | |
| self.assertEqual(set(os.listdir()), set(os.listdir(tmpdir))) | |
| os.chdir(self.dir) | |
| self.assertEqual(set(os.listdir()), expected) |
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The test_listdir test of test_os assumed that calling listdir on the
root directory twice gives the same results, however this can fail if
unrelated process create files in the root directory in between the two
calls. This changes the test to create a temporary directory with two
files inside and call listdir on this temporary directory instead.
https://bugs.python.org/issue39986