RateLimitTest.java

public class RateLimitTest {

    @Test
    public void throttle() {
        RateLimiter rateLimiter = RateLimiter.create(5, 5, TimeUnit.SECONDS);
        for (int i = 0; i < 25; ++i) {
            rateLimiter.acquire();
            System.out.println("i = " + i);
        }
        rateLimiter.setRate(1);
        for (int i = 25; i < 50; ++i) {
            rateLimiter.acquire();
            System.out.println("i = " + i);
        }
        rateLimiter = RateLimiter.create(5, 10, TimeUnit.SECONDS);
        for (int i = 51; i < 100; ++i) {
            rateLimiter.acquire();
            System.out.println("i = " + i);
        }
    }

}

This test exhibits the behavior I expected. The output is noticeably faster after a few second until i == 25, at which point the output is much slower. Once i == 51 though, the output does start to speed back up. I think this will work for ramping back up.