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-rw-r--r--Lib/test/pickletester.py8
1 files changed, 8 insertions, 0 deletions
diff --git a/Lib/test/pickletester.py b/Lib/test/pickletester.py
index fd446c81458..74b82caf742 100644
--- a/Lib/test/pickletester.py
+++ b/Lib/test/pickletester.py
@@ -1825,6 +1825,14 @@ class AbstractPickleTests:
t2 = self.loads(p)
self.assert_is_copy(t, t2)
+ def test_unicode_memoization(self):
+ # Repeated str is re-used (even when escapes added).
+ for proto in protocols:
+ for s in '', 'xyz', 'xyz\n', 'x\\yz', 'x\xa1yz\r':
+ p = self.dumps((s, s), proto)
+ s1, s2 = self.loads(p)
+ self.assertIs(s1, s2)
+
def test_bytes(self):
for proto in protocols:
for s in b'', b'xyz', b'xyz'*100: