/**
   * Waits for the {@link ServiceManager} to become {@linkplain #isHealthy() healthy}. The manager
   * will become healthy after all the component services have reached the {@linkplain State#RUNNING
   * running} state.
   *
   * @throws IllegalStateException if the service manager reaches a state from which it cannot
   *     become {@linkplain #isHealthy() healthy}.
   */
  public void awaitHealthy() {
    state.awaitHealthy();

   * This is for covering a case where the ServiceManager would behave strangely if constructed with
   * no service under management. Listeners would never fire because the ServiceManager was healthy
   * and stopped at the same time. This test ensures that listeners fire and isHealthy makes sense.
   */
  public void testEmptyServiceManager() {
    Logger logger = Logger.getLogger(ServiceManager.class.getName());
    logger.setLevel(Level.FINEST);

   * This is for covering a case where the ServiceManager would behave strangely if constructed with
   * no service under management. Listeners would never fire because the ServiceManager was healthy
   * and stopped at the same time. This test ensures that listeners fire and isHealthy makes sense.
   */
  public void testEmptyServiceManager() {
    Logger logger = Logger.getLogger(ServiceManager.class.getName());
    logger.setLevel(Level.FINEST);

Duchess sneezed occasionally; and as for the baby, it was
sneezing and howling alternately without a moment's pause.  The
only things in the kitchen that did not sneeze, were the cook,
and a large cat which was sitting on the hearth and grinning from
ear to ear.

  `Please would you tell me,' said Alice, a little timidly, for
she was not quite sure whether it was good manners for her to
speak first, `why your cat grins like that?'

Duchess sneezed occasionally; and as for the baby, it was
sneezing and howling alternately without a moment's pause.  The
only things in the kitchen that did not sneeze, were the cook,
and a large cat which was sitting on the hearth and grinning from
ear to ear.

  `Please would you tell me,' said Alice, a little timidly, for
she was not quite sure whether it was good manners for her to
speak first, `why your cat grins like that?'