@Test
public void testFindUniqueByField() throws IOException {

  createQueryFixtures();

  DUser u47 = userDao.findByEmail(null);
  assertNull(u47);

  u47 = userDao.findByEmail("user_47@example.com");
  assertEquals(Long.valueOf(47), u47.getId());
  assertEquals("user_47@example.com", u47.getEmail());
}