@Test(expected = IllegalArgumentException.class)
 public void testFindOneBySystemIdWithNullArg() throws Exception {
   dao.findOneBySystemId(null);
 }
  @Test
  public void testFindOneBySystemId() throws Exception {
    VprUpdate lastUpdate = dao.findOneBySystemId("A1B2");

    verify(mockGenericDao).findByUID(VprUpdate.class, "urn:va:vprupdate:A1B2");
  }