bpo-34984: Improve error messages for bytes and bytearray constructors. (GH-9874)

diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index 145411e..cc43321 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -169,6 +169,8 @@
         self.assertRaises(TypeError, self.type2test, [0.0])
         self.assertRaises(TypeError, self.type2test, [None])
         self.assertRaises(TypeError, self.type2test, [C()])
+        self.assertRaises(TypeError, self.type2test, encoding='ascii')
+        self.assertRaises(TypeError, self.type2test, errors='ignore')
         self.assertRaises(TypeError, self.type2test, 0, 'ascii')
         self.assertRaises(TypeError, self.type2test, b'', 'ascii')
         self.assertRaises(TypeError, self.type2test, 0, errors='ignore')