@classmethod
    def all(cls):
        for result in cls._query.all_index():
            yield cls.load(result, convert_key=False)
Test if it set the volume of sound (range 0 to 100)
dataset/ETHPy150Open coleifer/walrus/walrus/models.py/Model.all--crossover with--dataset/ETHPy150Open saltstack/salt/tests/unit/modules/mac_desktop_test.py/MacDesktopTestCase.test_set_output_volume