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bpo-26952: [argparse] clearer error when formatting an empty mutually… (GH-30099) (GH-30115)

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(cherry picked from commit 86de99588d)

Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
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Miss Islington (bot) 2021-12-15 04:24:48 -08:00 • committed by GitHub
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commit f0b274d2e2
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7
Lib/test/test_argparse.py
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@ -2582,6 +2582,13 @@ def test_help(self):
'''
self.assertEqual(parser.format_help(), textwrap.dedent(expected))
def test_empty_group(self):
# See issue 26952
parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group()
with self.assertRaises(ValueError):
parser.parse_args(['-h'])
class MEMixin(object):
def test_failures_when_not_required(self):