'Requesting a list of serializer formats popuates the registry'

def test_builtin_serializers(self):

    all_formats = set(serializers.get_serializer_formats())
    public_formats = set(serializers.get_public_serializer_formats())
    (self.assertIn('xml', all_formats),)
    self.assertIn('xml', public_formats)
    self.assertIn('json2', all_formats)
    self.assertIn('json2', public_formats)
    self.assertIn('python', all_formats)
    self.assertNotIn('python', public_formats)
