2 files changed, 44 insertions, 0 deletions
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index 381030f..13ad238 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -1169,6 +1169,28 @@ class BytesTest(BaseBytesTest, unittest.TestCase):
         self.assertEqual(bytes(ba), b'ab')
         self.assertRaises(TypeError, bytes, bb)
 
+    def test_repeat_id_preserving(self):
+        a = b'123abc1@'
+        b = b'456zyx-+'
+        self.assertEqual(id(a), id(a))
+        self.assertNotEqual(id(a), id(b))
+        self.assertNotEqual(id(a), id(a * -4))
+        self.assertNotEqual(id(a), id(a * 0))
+        self.assertEqual(id(a), id(a * 1))
+        self.assertEqual(id(a), id(1 * a))
+        self.assertNotEqual(id(a), id(a * 2))
+
+        class SubBytes(bytes):
+            pass
+
+        s = SubBytes(b'qwerty()')
+        self.assertEqual(id(s), id(s))
+        self.assertNotEqual(id(s), id(s * -4))
+        self.assertNotEqual(id(s), id(s * 0))
+        self.assertNotEqual(id(s), id(s * 1))
+        self.assertNotEqual(id(s), id(1 * s))
+        self.assertNotEqual(id(s), id(s * 2))
+
 
 class ByteArrayTest(BaseBytesTest, unittest.TestCase):
     type2test = bytearray
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index ffe3e82..a14eead 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -508,6 +508,28 @@ class UnicodeTest(string_tests.CommonTest,
         text = 'abc def'
         self.assertIs(text.replace(pattern, pattern), text)
 
+    def test_repeat_id_preserving(self):
+        a = '123abc1@'
+        b = '456zyx-+'
+        self.assertEqual(id(a), id(a))
+        self.assertNotEqual(id(a), id(b))
+        self.assertNotEqual(id(a), id(a * -4))
+        self.assertNotEqual(id(a), id(a * 0))
+        self.assertEqual(id(a), id(a * 1))
+        self.assertEqual(id(a), id(1 * a))
+        self.assertNotEqual(id(a), id(a * 2))
+
+        class SubStr(str):
+            pass
+
+        s = SubStr('qwerty()')
+        self.assertEqual(id(s), id(s))
+        self.assertNotEqual(id(s), id(s * -4))
+        self.assertNotEqual(id(s), id(s * 0))
+        self.assertNotEqual(id(s), id(s * 1))
+        self.assertNotEqual(id(s), id(1 * s))
+        self.assertNotEqual(id(s), id(s * 2))
+
     def test_bytes_comparison(self):
         with warnings_helper.check_warnings():
             warnings.simplefilter('ignore', BytesWarning)