@Test
  public void test_localTimeAsString_get_set_doesnt_mutate() {
    DateStuff ds = new DateStuff();

    LocalTime lt = new LocalTime(18, 19, 20, 123);
    ds.setALocalTimeAsString(lt);
    LocalTime dt1 = ds.getALocalTimeAsString();
    assertEquals(lt, dt1);
  }