@Test
public void subscribeToAExistingAlarmAlreadyHaveSubscription() throws Exception {

    Alarm addedAlarm = TestUtils.getDefaultAlarm();
    Alarm returnedAlarm = alarmService.subscribeToAAlarm(addedAlarm);
    verify(seyrenRepository, never()).addAlarm(any());
    verify(seyrenRepository, never()).addSubscription(any(), any());
    assertNotNull(returnedAlarm);
    assertEquals(addedAlarm.getId(), returnedAlarm.getId());
}