@Test
public void durationBetween4() {
Timestamp reference = Timestamp.of(10, 500000000);
assertThat(
reference.durationBetween(reference.minus(TimeDuration.ofMillis(600))),
equalTo(TimeDuration.ofMillis(600)));
}
@Test
public void durationBetween2() {
Timestamp reference = Timestamp.now();
assertThat(
reference.durationBetween(reference.minus(TimeDuration.ofNanos(10))),
equalTo(TimeDuration.ofNanos(10)));
}