def METHOD_NAME(self) -> None:
    exp_hash = self.exp_activity_reference.get_hash()
    collection_hash = self.collection_activity_reference.get_hash()
    invalid_activity_hash = (
        self.invalid_activity_reference_with_invalid_type.get_hash())
    self.assertNotEqual(exp_hash, collection_hash)
    self.assertNotEqual(exp_hash, invalid_activity_hash)
    self.assertNotEqual(collection_hash, invalid_activity_hash)