@VisibleForTesting
  protected List<NotificationChannel> getChannels() {
    return Arrays.asList(notificationChannels);
  }
@Test
  public void shouldProvideChannelList() {
    assertThat(underTest.getChannels()).containsOnly(emailChannel, twitterChannel);

    underTest = new DefaultNotificationManager(new NotificationChannel[] {}, dbClient);
    assertThat(underTest.getChannels()).isEmpty();
  }