@Test
  public void listScheduleEventsForAnExistingContributor() {
    String contributorId = "2";
    Set<ScheduleEvent> events = scheduleEventDao.listScheduleEventsByContributorId(contributorId);
    assertThat(events.size(), is(1));

    ScheduleEvent theEvent = events.iterator().next();
    assertThat(theEvent, isEqualTo(theScheduledEvent()));
  }
 @Test
 public void listScheduleEventsForAnUnexistingContributor() {
   String contributorId = "100";
   Set<ScheduleEvent> events = scheduleEventDao.listScheduleEventsByContributorId(contributorId);
   assertThat(events.isEmpty(), is(true));
 }