public boolean removeApplication(ApplicationId appId) {
    return collectorManager.remove(appId);
  }
@Test
  void testRemoveApplication() throws Exception {
    auxService = createCollectorAndAddApplication();
    // auxService should have a single app
    assertTrue(auxService.hasApplication(appAttemptId.getApplicationId()));

    ContainerId containerId = getAMContainerId();
    ContainerTerminationContext context =
        mock(ContainerTerminationContext.class);
    when(context.getContainerId()).thenReturn(containerId);
    when(context.getContainerType()).thenReturn(
        ContainerType.APPLICATION_MASTER);
    auxService.stopContainer(context);

    // auxService should not have that app
    assertFalse(auxService.hasApplication(appAttemptId.getApplicationId()));
    auxService.close();
  }