@Test
public void testMd5() throws Exception {

    final String admin = PasswordHandler.md5("admin");
    assertNotNull(admin);
    assertEquals(admin, "21232f297a57a5a743894a0e4a801fc3");
    final String test = PasswordHandler.md5("test");
    assertNotNull(test);
    assertEquals(test, "098f6bcd4621d373cade4e832627b4f6");
}