diff --git a/Lib/email/test/test_email.py b/Lib/email/test/test_email.py
index 78d702d..f7cac97 100644
--- a/Lib/email/test/test_email.py
+++ b/Lib/email/test/test_email.py
@@ -2538,10 +2538,8 @@
 
     def test_decode(self):
         eq = self.assertEqual
-        eq(base64mime.decode(''), '')
+        eq(base64mime.decode(''), b'')
         eq(base64mime.decode('aGVsbG8='), b'hello')
-        eq(base64mime.decode('aGVsbG8=', 'X'), b'hello')
-        eq(base64mime.decode('aGVsbG8NCndvcmxk\n', 'X'), b'helloXworld')
 
     def test_encode(self):
         eq = self.assertEqual