How to use the gokart.target.SingleFileTarget function in gokart

def test_make_target_with_processor(self):
        task = _DummyTask()
        processor = XmlFileProcessor()
        target = task.make_target('test.dummy', processor=processor)
        self.assertEqual(target._processor, processor)
        self.assertIsInstance(target, SingleFileTarget)

def test_default_target(self):
        task = _DummyTaskD()
        default_target = task.output()
        self.assertIsInstance(default_target, SingleFileTarget)
        self.assertEqual(f'./resources/test/test_task_on_kart/_DummyTaskD_{task.task_unique_id}.pkl', default_target._target.path)

def make_target(file_path: str, unique_id: Optional[str] = None, processor: Optional[FileProcessor] = None) -> TargetOnKart:
    file_path = _make_file_path(file_path, unique_id)
    processor = processor or make_file_processor(file_path)
    file_system_target = _make_file_system_target(file_path, processor=processor)
    return SingleFileTarget(target=file_system_target, processor=processor)