@Test
public void existReturnsWhetherAnEntityCanBeLoaded() throws Exception {
flushTestUsers();
assertTrue(userDao.exists(id));
assertFalse(userDao.exists(id * 27));
}
/** Flushes test users to the database. */
private void flushTestUsers() {
firstUser = userDao.save(firstUser);
secondUser = userDao.save(secondUser);
thirdUser = userDao.save(thirdUser);
userDao.flush();
id = firstUser.getId();
assertThat(id, is(notNullValue()));
assertThat(secondUser.getId(), is(notNullValue()));
assertThat(thirdUser.getId(), is(notNullValue()));
assertThat(userDao.exists(id), is(true));
assertThat(userDao.exists(secondUser.getId()), is(true));
assertThat(userDao.exists(thirdUser.getId()), is(true));
}