public void MessageCountIncreasedWhenAddingToQueue()
        {
            var queue         = new MemoryQueue <string>("queueName");
            var expectedCount = 5;

            for (var i = 0; i < expectedCount; i++)
            {
                queue.AddMessage($"item {i}");
            }

            var count = queue.GetApproximateMessageCountAsync().Result;

            UT.Assert.AreEqual(expectedCount, count);
        }