@Test
 public void removeResponsesOfAGivenUser() {
   ScheduleEvent scheduleEvent = scheduleEventDao.getScheduleEvent(theScheduledEvent().getId());
   assertThat(scheduleEvent.getResponses().size(), is(2));
   scheduleEventDao.purgeResponseScheduleEvent(scheduleEvent, 0);
   ScheduleEvent actual = scheduleEventDao.getScheduleEvent(scheduleEvent.getId());
   assertThat(actual.getResponses().size(), is(1));
 }
 @Test
 public void getAnUnexistingScheduleEvent() {
   ScheduleEvent actual = scheduleEventDao.getScheduleEvent("toto");
   assertThat(actual, nullValue());
 }
 @Test
 public void getAnExistingScheduleEvent() {
   ScheduleEvent expected = theScheduledEvent();
   ScheduleEvent actual = scheduleEventDao.getScheduleEvent(expected.getId());
   assertThat(actual, isEqualTo(expected));
 }