gh-131339: test PyBytes_Size for a zero-size bytes object (#131340)

diff --git a/Lib/test/test_capi/test_bytes.py b/Lib/test/test_capi/test_bytes.py
index 5908d79e14029bdabb731ac008c536a251f843f4..5b61c73381542dc3f3315d2b40c813b1d91a32f2 100644 (file)
--- a/Lib/test/test_capi/test_bytes.py
+++ b/Lib/test/test_capi/test_bytes.py
@@ -93,6 +93,7 @@ class CAPITest(unittest.TestCase):
         # Test PyBytes_Size()
         size = _testlimitedcapi.bytes_size
 
+        self.assertEqual(size(b''), 0)
         self.assertEqual(size(b'abc'), 3)
         self.assertEqual(size(BytesSubclass(b'abc')), 3)
         self.assertRaises(TypeError, size, bytearray(b'abc'))