diff --git a/Lib/email/test/test_email.py b/Lib/email/test/test_email.py
index 27ddc7c..5e4d9ba 100644
--- a/Lib/email/test/test_email.py
+++ b/Lib/email/test/test_email.py
@@ -204,8 +204,12 @@
         # Subpart 3 is base64
         eq(msg.get_payload(2).get_payload(decode=True),
            b'This is a Base64 encoded message.')
-        # Subpart 4 has no Content-Transfer-Encoding: header.
+        # Subpart 4 is base64 with a trailing newline, which
+        # used to be stripped (issue 7143).
         eq(msg.get_payload(3).get_payload(decode=True),
+           b'This is a Base64 encoded message.\n')
+        # Subpart 5 has no Content-Transfer-Encoding: header.
+        eq(msg.get_payload(4).get_payload(decode=True),
            b'This has no Content-Transfer-Encoding: header.\n')
 
     def test_get_decoded_uu_payload(self):