Silence BytesWarning while testing exception

Author: florentx

Lib/test/test_urllib.py

@@ -572,7 +572,8 @@ def test_unquoting(self):
                          "%s" % result)
         self.assertRaises((TypeError, AttributeError), urllib.parse.unquote, None)
         self.assertRaises((TypeError, AttributeError), urllib.parse.unquote, ())
-        self.assertRaises((TypeError, AttributeError), urllib.parse.unquote, b'')
+        with support.check_warnings(('', BytesWarning), quiet=True):
+            self.assertRaises((TypeError, AttributeError), urllib.parse.unquote, b'')
 
     def test_unquoting_badpercent(self):
         # Test unquoting on bad percent-escapes