diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index b1427b5..cb7fb46 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -888,11 +888,21 @@
 
     def test_translate(self):
         b = b'hello'
+        ba = bytearray(b)
         rosetta = bytearray(range(0, 256))
         rosetta[ord('o')] = ord('e')
         c = b.translate(rosetta, b'l')
         self.assertEqual(b, b'hello')
         self.assertEqual(c, b'hee')
+        c = ba.translate(rosetta, b'l')
+        self.assertEqual(ba, b'hello')
+        self.assertEqual(c, b'hee')
+        c = b.translate(None, b'e')
+        self.assertEqual(c, b'hllo')
+        c = ba.translate(None, b'e')
+        self.assertEqual(c, b'hllo')
+        self.assertRaises(TypeError, b.translate, None, None)
+        self.assertRaises(TypeError, ba.translate, None, None)
 
     def test_split_bytearray(self):
         self.assertEqual(b'a b'.split(memoryview(b' ')), [b'a', b'b'])