@Test
public void advanceTimeTest() {
Logger logger = new Logger(3, new ImmutableClock(0, 0));
observer.attachLogger(logger);
observer.advanceTime(new ImmutableClock(1, 100));
assertEquals(new ImmutableClock(1, 100), logger.getCurrentTime());
}
@Test(expected = IllegalArgumentException.class)
public void advanceIllegalTime() {
observer.advanceTime(null);
}
