limiter.acquire(); // R0.00, since it's the first request
    limiter.acquire(); // R0.20
    limiter.acquire(); // R0.20
    assertEvents("R0.00", "R0.20", "R0.20");
  }

  public void testImmediateTryAcquire() {
    RateLimiter r = RateLimiter.create(1);
    assertTrue("Unable to acquire initial permit", r.tryAcquire());
    assertFalse("Capable of acquiring secondary permit", r.tryAcquire());
  }

    limiter.acquire(); // R0.00, since it's the first request
    limiter.acquire(); // R0.20
    limiter.acquire(); // R0.20
    assertEvents("R0.00", "R0.20", "R0.20");
  }

  public void testImmediateTryAcquire() {
    RateLimiter r = RateLimiter.create(1);
    assertTrue("Unable to acquire initial permit", r.tryAcquire());
    assertFalse("Capable of acquiring secondary permit", r.tryAcquire());
  }