gh-101979: argparse: fix a bug where parentheses in metavar argument of add_argument() were dropped (GH-102318)

(cherry picked from commit 9a478be1a4314734c697dda7a7b0e633a6fb0751)

Co-authored-by: Yeojin Kim <yeojin.dev@gmail.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index 4d43e3310d..5df6f32630 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -3729,6 +3729,28 @@ class TestHelpUsage(HelpTestCase):
     version = ''
 
 
+class TestHelpUsageWithParentheses(HelpTestCase):
+    parser_signature = Sig(prog='PROG')
+    argument_signatures = [
+        Sig('positional', metavar='(example) positional'),
+        Sig('-p', '--optional', metavar='{1 (option A), 2 (option B)}'),
+    ]
+
+    usage = '''\
+        usage: PROG [-h] [-p {1 (option A), 2 (option B)}] (example) positional
+        '''
+    help = usage + '''\
+
+        positional arguments:
+          (example) positional
+
+        options:
+          -h, --help            show this help message and exit
+          -p {1 (option A), 2 (option B)}, --optional {1 (option A), 2 (option B)}
+        '''
+    version = ''
+
+
 class TestHelpOnlyUserGroups(HelpTestCase):
     """Test basic usage messages"""