@Test
public void shouldBeAbleToAdvanceClockTimeOnEachQuery() throws Exception {
Date startOfTheCentury = ymdDateFormat.parse("2000-01-01");
new DateAlteringClock(startOfTheCentury).advanceMillisOnEachQuery();
assertThat(Clock.currentTimeInMillis(), is(startOfTheCentury.getTime() + 1));
assertThat(Clock.currentTimeInMillis(), is(startOfTheCentury.getTime() + 2));
assertThat(Clock.currentTimeInMillis(), is(startOfTheCentury.getTime() + 3));
}
@Test
public void currentClockTimeInMillisShouldTickOnFromZero() throws Exception {
Date endOfTheDecade = ymdDateFormat.parse("2010-12-31");
new DateAlteringClock(endOfTheDecade);
long before = 0, after = 0;
while (after == before) {
after = Clock.currentTimeInMillis();
if (before == 0) {
before = after;
}
}
assertTrue(Clock.currentTimeInMillis() - endOfTheDecade.getTime() < 1000);
}
@Test
public void shouldBeAbleToFreezeClockTime() throws Exception {
SystemClock systemClock = new SystemClock();
long before = 0, after = 0;
new DateAlteringClock(systemClock.currentClockDate()).freeze();
long frozenTime = Clock.currentTimeInMillis();
while (after == before) {
after = systemClock.currentClockTimeInMillis();
if (before == 0) {
before = after;
}
}
assertThat(Clock.currentTimeInMillis(), is(frozenTime));
}
@Test
public void shouldBeAbleToDefineElapsedTime() throws Exception {
Date startOfTheCentury = ymdDateFormat.parse("2000-01-01");
new DateAlteringClock(startOfTheCentury).freeze().elapse(39);
assertThat(Clock.currentTimeInMillis(), is(startOfTheCentury.getTime() + 39));
}
@Test
public void currentClockTimeInMillisShouldBeRebasedToConstructorArg() throws Exception {
Date startOfTheDecade = ymdDateFormat.parse("2010-01-01");
new DateAlteringClock(startOfTheDecade);
assertThat(ymdDateFormat.format(new Date(Clock.currentTimeInMillis())), is("2010-01-01"));
}