Method get_callback_lambda

tests/test_scene_manager.py:92–94

For testing using a lambda..

(self)

        self.scene_list: list[int] = []

    def get_callback_lambda(self):
        """For testing using a lambda.."""
        return lambda image, frame_num: self._callback(image, frame_num)

    def get_callback_func(self):
        """For testing using a callback function."""