[Python-checkins] [3.12] gh-130655: Increase test coverage of gettext._expand_lang() (GH-130656) (GH-130672)

[serhiy-storchaka]

https://github.com/python/cpython/commit/aa91a11c4018c83f83fa456e17373d4e30d1a7fc
commit: aa91a11c4018c83f83fa456e17373d4e30d1a7fc
branch: 3.12
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: serhiy-storchaka <storch...@gmail.com>
date: 2025-02-28T08:58:09Z
summary:

[3.12] gh-130655: Increase test coverage of gettext._expand_lang() (GH-130656) 
(GH-130672)

(cherry picked from commit 24c52cb14c4b044154bd46bd1b2a9c37076caeb9)

Co-authored-by: Tomas R <tomas.ro...@gmail.com>

files:
M Lib/test/test_gettext.py

diff --git a/Lib/test/test_gettext.py b/Lib/test/test_gettext.py
index 82f5250c6396e6..8856cf2db2099c 100644
--- a/Lib/test/test_gettext.py
+++ b/Lib/test/test_gettext.py
@@ -2,6 +2,7 @@
 import base64
 import gettext
 import unittest
+import unittest.mock
 from functools import partial
 
 from test import support
@@ -739,6 +740,32 @@ def test_cache(self):
         self.assertEqual(t.__class__, DummyGNUTranslations)
 
 
+class ExpandLangTestCase(unittest.TestCase):
+    def test_expand_lang(self):
+        # Test all combinations of territory, charset and
+        # modifier (locale extension)
+        locales = {
+            'cs': ['cs'],
+            'cs_CZ': ['cs_CZ', 'cs'],
+            'cs.ISO8859-2': ['cs.ISO8859-2', 'cs'],
+            'cs@euro': ['cs@euro', 'cs'],
+            'cs_CZ.ISO8859-2': ['cs_CZ.ISO8859-2', 'cs_CZ', 'cs.ISO8859-2',
+                                'cs'],
+            'cs_CZ@euro': ['cs_CZ@euro', 'cs@euro', 'cs_CZ', 'cs'],
+            'cs.ISO8859-2@euro': ['cs.ISO8859-2@euro', 'cs@euro',
+                                  'cs.ISO8859-2', 'cs'],
+            'cs_CZ.ISO8859-2@euro': ['cs_CZ.ISO8859-2@euro', 'cs_CZ@euro',
+                                     'cs.ISO8859-2@euro', 'cs@euro',
+                                     'cs_CZ.ISO8859-2', 'cs_CZ',
+                                     'cs.ISO8859-2', 'cs'],
+        }
+        for locale, expanded in locales.items():
+            with self.subTest(locale=locale):
+                with unittest.mock.patch("locale.normalize",
+                                         return_value=locale):
+                    self.assertEqual(gettext._expand_lang(locale), expanded)
+
+
 class MiscTestCase(unittest.TestCase):
     def test__all__(self):
         support.check__all__(self, gettext,

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