@Override
  public String toString()
  {
    return "id: " + super.toString() + ", entity: " + (_entity == null ? "" : _entity);
  }
@Test
  public void testToString()
  {
    IdEntityResponse<Long, AnyRecord> longIdEntityResponse = new IdEntityResponse<>(6L, new AnyRecord());
    Assert.assertEquals(longIdEntityResponse.toString(), "id: 6, entity: {}");

    IdEntityResponse<Long, AnyRecord> nullIdEntityResponse = new IdEntityResponse<>(null, new AnyRecord());
    Assert.assertEquals(nullIdEntityResponse.toString(), "id: , entity: {}");
  }