@Test
  public void testEventSessionTime() {

    Event testEvent = createEvent();

    Assert.assertEquals(testEvent.getSessionsSet().size(), 1);

    eventService.addSessionTime(testEvent, DateTime.now().plusDays(5));
    eventService.addSessionTime(testEvent, DateTime.now().plusDays(6));
    eventService.addSessionTime(testEvent, DateTime.now().plusDays(7));

    Assert.assertEquals(testEvent.getSessionsSet().size(), 4);
    Assert.assertTrue(testEvent.getSessionsSet().contains(TESTED_DATE));

    eventService.removeSessionTime(testEvent, TESTED_DATE);
    Assert.assertFalse(testEvent.getSessionsSet().contains(TESTED_DATE));
  }