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-rw-r--r--Lib/test/test_io.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index c48ec3a239..8a2111cbd7 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1812,7 +1812,7 @@ class BufferedRWPairTest(unittest.TestCase):
with self.subTest(method):
pair = self.tp(self.BytesIO(b"abcdef"), self.MockRawIO())
- data = byteslike(5)
+ data = byteslike(b'\0' * 5)
self.assertEqual(getattr(pair, method)(data), 5)
self.assertEqual(bytes(data), b"abcde")