Adapted from https://github.com/python-mechanize/mechanize/commit/1324b09b661aaac7d4cdc7e1e9d49e1c3851db2c


--- a/tests/test_future/test_urllib2.py
+++ b/tests/test_future/test_urllib2.py
@@ -709,7 +709,8 @@
              ["foo", "bar"], "", None),
             ("ftp://localhost/baz.gif;type=a",
              "localhost", ftplib.FTP_PORT, "", "", "A",
-             [], "baz.gif", None),
+             [], "baz.gif",
+             "image/gif" if sys.version_info >= (3, 11) else None),
             ("ftp://localhost/baz.gif",
              "localhost", ftplib.FTP_PORT, "", "", "I",
              [], "baz.gif", "image/gif"),