@Test
void shouldAddTo()
{

    IsoDuration duration = newDuration( 1, 2, 3, 4 );
    LocalDateTime dateTime = LocalDateTime.of( 1990, 1, 1, 0, 0, 0, 0 );
    Temporal result = duration.addTo( dateTime );
    assertEquals( LocalDateTime.of( 1990, 2, 3, 0, 0, 3, 4 ), result );
}