'Test that setting a new field changes the value'

def test_set_missing_field(self):

    with self.assertNumQueries(1):
        self.kvs.set(self.key_factory('missing_field'), 'new_value')
    self.assertEquals(2, self.storage_class.objects.all().count())
    self.assertEquals('old_value', json.loads(self.storage_class.objects.get(field_name='existing_field').value))
    self.assertEquals('new_value', json.loads(self.storage_class.objects.get(field_name='missing_field').value))
