public void RemoveDomain_NoLongerRateLimitsThatDomain()
        {
            //Arrange
            var domainRateLimiter = new DomainRateLimiter(5);
            var domain = new Uri("http://a.com");

            domainRateLimiter.AddDomain(domain, 1000);

            //Act
            domainRateLimiter.RemoveDomain(domain);

            //Assert
            var timer = System.Diagnostics.Stopwatch.StartNew();
            domainRateLimiter.RateLimit(domain);
            domainRateLimiter.RateLimit(domain);
            timer.Stop();

            Assert.IsTrue(timer.ElapsedMilliseconds < 25, "Expected it to take less than 25 millisecs but only took " + timer.ElapsedMilliseconds);
        }