@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());
}