RateLimiter limiter = RateLimiter.create(5.0, 5, SECONDS);
    assertEquals(5.0, limiter.getRate());
    limiter.setRate(10.0);
    assertEquals(10.0, limiter.getRate());

    assertThrows(IllegalArgumentException.class, () -> limiter.setRate(0.0));
    assertThrows(IllegalArgumentException.class, () -> limiter.setRate(-10.0));
  }

  public void testAcquireParameterValidation() {
    RateLimiter limiter = RateLimiter.create(999);

  }

  @VisibleForTesting
  static RateLimiter create(double permitsPerSecond, SleepingStopwatch stopwatch) {
    RateLimiter rateLimiter = new SmoothBursty(stopwatch, 1.0 /* maxBurstSeconds */);
    rateLimiter.setRate(permitsPerSecond);
    return rateLimiter;
  }

  /**
   * Creates a {@code RateLimiter} with the specified stable throughput, given as "permits per

    RateLimiter limiter = RateLimiter.create(5.0, 5, SECONDS);
    assertEquals(5.0, limiter.getRate());
    limiter.setRate(10.0);
    assertEquals(10.0, limiter.getRate());

    assertThrows(IllegalArgumentException.class, () -> limiter.setRate(0.0));
    assertThrows(IllegalArgumentException.class, () -> limiter.setRate(-10.0));
  }

  public void testAcquireParameterValidation() {
    RateLimiter limiter = RateLimiter.create(999);