stopwatch.reset();
    assertFalse(stopwatch.isRunning());
    ticker.advance(3);
    assertEquals(0, stopwatch.elapsed(NANOSECONDS));
  }

  public void testElapsed_whileRunning() {
    ticker.advance(78);
    stopwatch.start();
    assertEquals(0, stopwatch.elapsed(NANOSECONDS));

    ticker.advance(345);
    assertEquals(345, stopwatch.elapsed(NANOSECONDS));
  }