expect(queue.items).toStrictEqual({ 0: 1, 1: 2 })
rtSize = queue.enqueue(3)
expect(queue.size).toBe(3)
expect(rtSize).toBe(queue.size)
expect(queue.head).toBe(0)
expect(queue.tail).toBe(3)
expect(queue.items).toStrictEqual({ 0: 1, 1: 2 })
rtSize = queue.enqueue(3)
expect(queue.size).toBe(3)
expect(rtSize).toBe(queue.size)
expect(queue.head).toBe(0)
expect(queue.tail).toBe(3)