public async Task SetQueueUrl_caches()
        {
            var settings = new SettingsHolder();

            var configuration = new TransportConfiguration(settings);
            var sqsClient     = new MockSqsClient();

            var cache = new QueueCache(sqsClient, configuration);

            cache.SetQueueUrl("fakeQueueName", "http://fakeQueueName");

            await cache.GetQueueUrl("fakeQueueName");

            Assert.IsEmpty(sqsClient.QueueUrlRequestsSent);
        }