          data['content'] = 'A comment from foo@bar.com'
  
          serializer = CommentSerializerWithCrossFieldValidator(data=data)
          self.assertFalse(serializer.is_valid())
          self.assertEquals(serializer.errors, {'non_field_errors': [u'Email address not in content']})
  
      def test_null_is_true_fields(self):
          """
          Omitting a value for null-field should validate.
          """
 
</s> remove         self.assertEquals(serializer.errors, {'content': [u'Test not in value']})
 </s> add         self.assertEquals(serializer.errors, {'content': ['Test not in value']}) </s> remove         self.assertEquals(serializer.errors, {'email': [u'This field is required.']})
 </s> add         self.assertEquals(serializer.errors, {'email': ['This field is required.']}) </s> remove         self.assertEquals(serializer.errors, {'isbn': [u'isbn has to be exact 13 numbers']})
 </s> add         self.assertEquals(serializer.errors, {'isbn': ['isbn has to be exact 13 numbers']}) </s> remove         elif hasattr(value, '__iter__') and not isinstance(value, (dict, basestring)):
 </s> add         elif hasattr(value, '__iter__') and not isinstance(value, (dict, six.string_types)): </s> remove         self.assertEquals(serializer.errors, {'isbn': [u'isbn has to be exact 13 numbers']})
 </s> add         self.assertEquals(serializer.errors, {'isbn': ['isbn has to be exact 13 numbers']})
        self.assertEquals(serializer.errors, {'non_field_errors': ['Email address not in content']})
          data['content'] = 'A comment from foo@bar.com'
  
          serializer = CommentSerializerWithCrossFieldValidator(data=data)
          self.assertFalse(serializer.is_valid())
        self.assertEquals(serializer.errors, {'non_field_errors': ['Email address not in content']})
  
      def test_null_is_true_fields(self):
          """
          Omitting a value for null-field should validate.
          """
keep keep keep keep replace keep keep keep keep keep
 First passing test under p3k \o/ 
rest_framework/tests/serializer.py