#12266: Fix str.capitalize() to correctly uppercase/lowercase titlecased and cased non-letter characters.
diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py
index fca38c3..d792529 100644
--- a/Lib/test/string_tests.py
+++ b/Lib/test/string_tests.py
@@ -641,6 +641,23 @@
self.checkequal('Aaaa', 'aaaa', 'capitalize')
self.checkequal('Aaaa', 'AaAa', 'capitalize')
+ # check that titlecased chars are lowered correctly
+ # \u1ffc is the titlecased char
+ self.checkequal('\u1ffc\u1ff3\u1ff3\u1ff3',
+ '\u1ff3\u1ff3\u1ffc\u1ffc', 'capitalize')
+ # check with cased non-letter chars
+ self.checkequal('\u24c5\u24e8\u24e3\u24d7\u24de\u24dd',
+ '\u24c5\u24ce\u24c9\u24bd\u24c4\u24c3', 'capitalize')
+ self.checkequal('\u24c5\u24e8\u24e3\u24d7\u24de\u24dd',
+ '\u24df\u24e8\u24e3\u24d7\u24de\u24dd', 'capitalize')
+ self.checkequal('\u2160\u2171\u2172',
+ '\u2160\u2161\u2162', 'capitalize')
+ self.checkequal('\u2160\u2171\u2172',
+ '\u2170\u2171\u2172', 'capitalize')
+ # check with Ll chars with no upper - nothing changes here
+ self.checkequal('\u019b\u1d00\u1d86\u0221\u1fb7',
+ '\u019b\u1d00\u1d86\u0221\u1fb7', 'capitalize')
+
self.checkraises(TypeError, 'hello', 'capitalize', 42)
def test_lower(self):