public ApplicationBuilder qosEnable(Boolean qosEnable) {
        this.qosEnable = qosEnable;
        return getThis();
    }
@Test
    void qosEnable() {
        ApplicationBuilder builder = new ApplicationBuilder();
        builder.qosEnable(true);
        Assertions.assertTrue(builder.build().getQosEnable());
        builder.qosEnable(false);
        Assertions.assertFalse(builder.build().getQosEnable());
        builder.qosEnable(null);
        Assertions.assertNull(builder.build().getQosEnable());
    }