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[3.15] gh-155648: In IDLE tests, call unittest.main without exit arg (GH-156249) - #156251
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…ythonGH-156249) * pythongh-155648: In IDLE tests, call unittest.main without exit arg DD bug 73: In idlelib.idle_test, test_xyz.py files should end with if __name__ == '__main__': unittest.main(verbosity=2) The default exit is True. This need not and should not be added. 5 files add the confusing equivalent exit=2 ("why the weird value?"), 4 files add exit=False. This is nonsensical when there is nothing more to run; main will immediately exit anyway. When running a test file from an IDLE editor, this argument has no visible effect. However, a Claude-based bug finder claims that in other circumstances (such as a program running the test in a shell), the good test may falsely fail. Even if this is not true, it can only confuse a reader. (The only place in idlelib for exit=False is in idlelib/abc.py files where the unittest is followed by an htest. The default exit=True exits the process, skipping the htest.) As part of editing the discussion of this in idle_test/htest.py, I clarified other things. (cherry picked from commit c20318b) Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
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Sep 28, 2026
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DD bug 73: In idlelib.idle_test, test_xyz.py files should end with
if name == 'main':
unittest.main(verbosity=2)
The default exit is True. This need not and should not be added.
5 files add the confusing equivalent exit=2 ("why the weird value?"),
4 files add exit=False. This is nonsensical when there is nothing more to run;
main will immediately exit anyway. When running a test file from an IDLE editor,
this argument has no visible effect. However, a Claude-based
bug finder claims that in other circumstances (such as a program running
the test in a shell), the good test may falsely fail. Even if this is
not true, it can only confuse a reader.
(The only place in idlelib for exit=False is in idlelib/abc.py files where the unittest
is followed by an htest. The default exit=True exits the process, skipping the htest.)
As part of editing the discussion of this in idle_test/htest.py, I clarified other things.
(cherry picked from commit c20318b)
Co-authored-by: Terry Jan Reedy tjreedy@udel.edu