@Test
void onSubscribeError() {

    // SETUP
    final Mqtt3SubAck subAck = mock(Mqtt3SubAck.class);
    final Throwable throwable = mock(Throwable.class);
    // CALL
    this.instance.onSubscribe(this.mqttClientAdapter, subAck, throwable);
    // VERIFY
    verifyNoMoreInteractions(subAck);
}