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-rw-r--r--Lib/test/test_builtin.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index ce1586f..aa9b4e2 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -1128,6 +1128,9 @@ class BuiltinTest(unittest.TestCase):
self.assertRaises(TypeError, sum, 42)
self.assertRaises(TypeError, sum, ['a', 'b', 'c'])
self.assertRaises(TypeError, sum, ['a', 'b', 'c'], '')
+ self.assertRaises(TypeError, sum, [b'a', b'c'], b'')
+ values = [bytearray(b'a'), bytearray(b'b')]
+ self.assertRaises(TypeError, sum, values, bytearray(b''))
self.assertRaises(TypeError, sum, [[1], [2], [3]])
self.assertRaises(TypeError, sum, [{2:3}])
self.assertRaises(TypeError, sum, [{2:3}]*2, {2:3})