+describe('Priority queue test suite', () => {
+ it('Verify constructor() behavior', () => {
+ expect(() => new PriorityQueue('')).toThrow(
+ new TypeError("Invalid bucket size: '' is not an integer")
+ )
+ expect(() => new PriorityQueue(-1)).toThrow(
+ new RangeError('Invalid bucket size: -1 < 0')
+ )
+ let priorityQueue = new PriorityQueue()
+ expect(priorityQueue.bucketSize).toBe(defaultBucketSize)
+ expect(priorityQueue.buckets).toBe(0)
+ expect(priorityQueue.size).toBe(0)
+ expect(priorityQueue.maxSize).toBe(0)
+ expect(priorityQueue.enablePriority).toBe(false)
+ expect(priorityQueue.head).toBeInstanceOf(FixedPriorityQueue)
+ expect(priorityQueue.head.next).toBe(undefined)
+ expect(priorityQueue.head.capacity).toBe(defaultBucketSize)
+ expect(priorityQueue.tail).toBeInstanceOf(FixedPriorityQueue)
+ expect(priorityQueue.tail).toStrictEqual(priorityQueue.head)
+ const bucketSize = 2
+ priorityQueue = new PriorityQueue(bucketSize, true)
+ expect(priorityQueue.bucketSize).toBe(bucketSize)
+ expect(priorityQueue.buckets).toBe(0)
+ expect(priorityQueue.size).toBe(0)
+ expect(priorityQueue.maxSize).toBe(0)
+ expect(priorityQueue.enablePriority).toBe(true)
+ expect(priorityQueue.head).toBeInstanceOf(FixedPriorityQueue)
+ expect(priorityQueue.head.next).toBe(undefined)
+ expect(priorityQueue.head.capacity).toBe(bucketSize)
+ expect(priorityQueue.tail).toBeInstanceOf(FixedPriorityQueue)
+ expect(priorityQueue.tail).toStrictEqual(priorityQueue.head)
+ })
+
+ it('Verify default bucket size enqueue() behavior', () => {
+ const priorityQueue = new PriorityQueue(defaultBucketSize, true)
+ let rtSize = priorityQueue.enqueue(1)
+ expect(priorityQueue.buckets).toBe(0)
+ expect(priorityQueue.size).toBe(1)
+ expect(priorityQueue.maxSize).toBe(1)
+ expect(rtSize).toBe(priorityQueue.size)
+ expect(priorityQueue.head.nodeArray).toMatchObject([
+ { data: 1, priority: 0 },
+ ])
+ expect(priorityQueue.head.next).toBe(undefined)
+ expect(priorityQueue.tail).toStrictEqual(priorityQueue.head)
+ rtSize = priorityQueue.enqueue(2)
+ expect(priorityQueue.buckets).toBe(0)
+ expect(priorityQueue.size).toBe(2)
+ expect(priorityQueue.maxSize).toBe(2)
+ expect(rtSize).toBe(priorityQueue.size)
+ expect(priorityQueue.head.nodeArray).toMatchObject([
+ { data: 1, priority: 0 },
+ { data: 2, priority: 0 },
+ ])
+ expect(priorityQueue.head.next).toBe(undefined)
+ expect(priorityQueue.tail).toStrictEqual(priorityQueue.head)
+ rtSize = priorityQueue.enqueue(3)
+ expect(priorityQueue.buckets).toBe(0)
+ expect(priorityQueue.size).toBe(3)
+ expect(priorityQueue.maxSize).toBe(3)
+ expect(rtSize).toBe(priorityQueue.size)
+ expect(priorityQueue.head.nodeArray).toMatchObject([
+ { data: 1, priority: 0 },
+ { data: 2, priority: 0 },
+ { data: 3, priority: 0 },
+ ])
+ expect(priorityQueue.head.next).toBe(undefined)
+ expect(priorityQueue.tail).toStrictEqual(priorityQueue.head)
+ rtSize = priorityQueue.enqueue(3, -1)
+ expect(priorityQueue.buckets).toBe(0)
+ expect(priorityQueue.size).toBe(4)
+ expect(priorityQueue.maxSize).toBe(4)
+ expect(rtSize).toBe(priorityQueue.size)
+ expect(priorityQueue.head.nodeArray).toMatchObject([
+ { data: 3, priority: -1 },
+ { data: 1, priority: 0 },
+ { data: 2, priority: 0 },
+ { data: 3, priority: 0 },
+ ])
+ expect(priorityQueue.head.next).toBe(undefined)
+ expect(priorityQueue.tail).toStrictEqual(priorityQueue.head)
+ rtSize = priorityQueue.enqueue(1, 1)
+ expect(priorityQueue.buckets).toBe(0)
+ expect(priorityQueue.size).toBe(5)
+ expect(priorityQueue.maxSize).toBe(5)
+ expect(rtSize).toBe(priorityQueue.size)
+ expect(priorityQueue.head.nodeArray).toMatchObject([
+ { data: 3, priority: -1 },
+ { data: 1, priority: 0 },
+ { data: 2, priority: 0 },
+ { data: 3, priority: 0 },
+ { data: 1, priority: 1 },
+ ])
+ expect(priorityQueue.head.next).toBe(undefined)
+ expect(priorityQueue.tail).toStrictEqual(priorityQueue.head)
+ })
+
+ it('Verify bucketSize=2 enqueue() behavior', () => {
+ const priorityQueue = new PriorityQueue(2, true)