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| -rw-r--r-- | Lib/test/string_tests.py | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py index 3a5fbfe..f76a9eb 100644 --- a/Lib/test/string_tests.py +++ b/Lib/test/string_tests.py @@ -882,6 +882,25 @@ class MixinStrUnicodeUserStringTest: else: self.checkcall(format, "__mod__", value) + def test_inplace_rewrites(self): + # Check that strings don't copy and modify cached single-character strings + self.checkequal('a', 'A', 'lower') + self.checkequal(True, 'A', 'isupper') + self.checkequal('A', 'a', 'upper') + self.checkequal(True, 'a', 'islower') + + self.checkequal('a', 'A', 'replace', 'A', 'a') + self.checkequal(True, 'A', 'isupper') + + self.checkequal('A', 'a', 'capitalize') + self.checkequal(True, 'a', 'islower') + + self.checkequal('A', 'a', 'swapcase') + self.checkequal(True, 'a', 'islower') + + self.checkequal('A', 'a', 'title') + self.checkequal(True, 'a', 'islower') + class MixinStrStringUserStringTest: # Additional tests for 8bit strings, i.e. str, UserString and |