@Test
 public void getUserByEmail_usesDAO() {
   when(userRepository.findByEmail(USER_A_EMAIL)).thenReturn(Sets.newHashSet(userAStored));
   User user = communityServiceImpl.getUserByEmail(userA.getEmail());
   verify(userRepository, times(1)).findByEmail(USER_A_EMAIL);
   assertEquals(user, userAStored);
 }