ticker.advance(25);
    assertEquals(34, stopwatch.elapsed(NANOSECONDS));

    stopwatch.stop();
    ticker.advance(36);
    assertEquals(34, stopwatch.elapsed(NANOSECONDS));
  }

  public void testElapsed_micros() {
    stopwatch.start();
    ticker.advance(999);
    assertEquals(0, stopwatch.elapsed(MICROSECONDS));
    ticker.advance(1);
    assertEquals(1, stopwatch.elapsed(MICROSECONDS));
  }