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-rw-r--r--Lib/test/test_unicode.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index bef64aa..bf0ddca 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -566,6 +566,9 @@ class UnicodeTest(string_tests.CommonTest,
self.assertEqual('\U0008fffe'.lower(), '\U0008fffe')
self.assertEqual('\u2177'.lower(), '\u2177')
+ # See issue #18183 for this one.
+ '\U00010000\U00100000'.lower()
+
def test_casefold(self):
self.assertEqual('hello'.casefold(), 'hello')
self.assertEqual('hELlo'.casefold(), 'hello')