def METHOD_NAME(self):
    # when
    parent_indicator = Indicator.objects.get(result__project=self.parent_project)
    self.child_project.import_results()
    # then
    with self.assertRaises(ValidationError) as context:
        self.child_project.import_indicator(parent_indicator.pk)
    exception = context.exception
    self.assertEqual(exception.message, "Indicator already exists")