assertEquals(0, stopwatch.elapsed(MILLISECONDS));
    ticker.advance(1);
    assertEquals(1, stopwatch.elapsed(MILLISECONDS));
  }

  @J2ktIncompatible // TODO(b/259213718): Switch J2kt to String.format("%.4g") once that's supported
  public void testToString() {
    stopwatch.start();
    assertThat(stopwatch.toString()).isEqualTo("0.000 ns");
    ticker.advance(1);
    assertThat(stopwatch.toString()).isEqualTo("1.000 ns");