Fix second warning

Author: StanFromIreland

Lib/test/test_email/test_headerregistry.py

@@ -1,6 +1,7 @@
 import datetime
 import textwrap
 import unittest
+import warnings
 from email import errors
 from email import policy
 from email.message import Message
@@ -247,7 +248,15 @@ def content_type_as_value(self,
         decoded =  args[2] if l>2 and args[2] is not DITTO else source
         header = 'Content-Type:' + ' ' if source else ''
         folded = args[3] if l>3 else header + decoded + '\n'
-        h = self.make_header('Content-Type', source)
+        # Suppress deprecation warning for rfc2231_nonascii_in_charset_of_charset_parameter_value
+        if 'utf-8%E2%80%9D' in source:
+            with warnings.catch_warnings():
+                warnings.filterwarnings('ignore',
+                    message='Support for non-ascii encoding names',
+                    category=DeprecationWarning)
+                h = self.make_header('Content-Type', source)
+        else:
+            h = self.make_header('Content-Type', source)
         self.assertEqual(h.content_type, content_type)
         self.assertEqual(h.maintype, maintype)
         self.assertEqual(h.subtype, subtype)