public void return_to_pool_directly()
        {
            var sut = new BufferSlicePool(10, 2);
            var buffer = sut.Pop();
            sut.Push(buffer);

            sut.Pop();
            sut.Pop();
        }
        public void return_to_pool__verify_that_it_got_enqueued()
        {
            var sut = new BufferSlicePool(10, 2);
            var buffer = sut.Pop();
            
            sut.Push(buffer);

            sut.Pop();
            sut.Pop();
        }