@Override
  public long getQueueSize() {
    return asyncExecutionMonitoring.getQueueSize();
  }
@Test
  public void getQueueSize_delegates_to_AsyncExecutionMonitoring() {
    when(asyncExecutionMonitoring.getQueueSize()).thenReturn(12);

    assertThat(underTest.getQueueSize()).isEqualTo(12);

    verify(asyncExecutionMonitoring).getQueueSize();
  }