| 1 | import { expect } from 'expect' |
| 2 | |
| 3 | import { PriorityQueue } from '../lib/priority-queue.cjs' |
| 4 | |
| 5 | describe('Priority queue test suite', () => { |
| 6 | it('Verify constructor() behavior', () => { |
| 7 | expect(() => new PriorityQueue('')).toThrow( |
| 8 | new TypeError('bucketSize must be an integer') |
| 9 | ) |
| 10 | expect(() => new PriorityQueue(-1)).toThrow( |
| 11 | new RangeError('bucketSize must be greater than or equal to 1') |
| 12 | ) |
| 13 | expect(() => new PriorityQueue(0)).toThrow( |
| 14 | new RangeError('bucketSize must be greater than or equal to 1') |
| 15 | ) |
| 16 | let priorityQueue = new PriorityQueue() |
| 17 | expect(priorityQueue.bucketSize).toBe(Number.POSITIVE_INFINITY) |
| 18 | expect(priorityQueue.buckets).toBe(1) |
| 19 | expect(priorityQueue.size).toBe(0) |
| 20 | expect(priorityQueue.maxSize).toBe(0) |
| 21 | expect(priorityQueue.nodeArray).toStrictEqual([]) |
| 22 | priorityQueue = new PriorityQueue(2) |
| 23 | expect(priorityQueue.bucketSize).toBe(2) |
| 24 | expect(priorityQueue.buckets).toBe(0) |
| 25 | expect(priorityQueue.size).toBe(0) |
| 26 | expect(priorityQueue.maxSize).toBe(0) |
| 27 | expect(priorityQueue.nodeArray).toStrictEqual([]) |
| 28 | }) |
| 29 | |
| 30 | it('Verify default bucketSize enqueue() behavior', () => { |
| 31 | const priorityQueue = new PriorityQueue() |
| 32 | let rtSize = priorityQueue.enqueue(1) |
| 33 | expect(priorityQueue.buckets).toBe(1) |
| 34 | expect(priorityQueue.size).toBe(1) |
| 35 | expect(priorityQueue.maxSize).toBe(1) |
| 36 | expect(rtSize).toBe(priorityQueue.size) |
| 37 | expect(priorityQueue.nodeArray).toStrictEqual([{ data: 1, priority: 0 }]) |
| 38 | rtSize = priorityQueue.enqueue(2) |
| 39 | expect(priorityQueue.buckets).toBe(1) |
| 40 | expect(priorityQueue.size).toBe(2) |
| 41 | expect(priorityQueue.maxSize).toBe(2) |
| 42 | expect(rtSize).toBe(priorityQueue.size) |
| 43 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 44 | { data: 1, priority: 0 }, |
| 45 | { data: 2, priority: 0 } |
| 46 | ]) |
| 47 | rtSize = priorityQueue.enqueue(3) |
| 48 | expect(priorityQueue.buckets).toBe(1) |
| 49 | expect(priorityQueue.size).toBe(3) |
| 50 | expect(priorityQueue.maxSize).toBe(3) |
| 51 | expect(rtSize).toBe(priorityQueue.size) |
| 52 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 53 | { data: 1, priority: 0 }, |
| 54 | { data: 2, priority: 0 }, |
| 55 | { data: 3, priority: 0 } |
| 56 | ]) |
| 57 | rtSize = priorityQueue.enqueue(3, -1) |
| 58 | expect(priorityQueue.buckets).toBe(1) |
| 59 | expect(priorityQueue.size).toBe(4) |
| 60 | expect(priorityQueue.maxSize).toBe(4) |
| 61 | expect(rtSize).toBe(priorityQueue.size) |
| 62 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 63 | { data: 3, priority: -1 }, |
| 64 | { data: 1, priority: 0 }, |
| 65 | { data: 2, priority: 0 }, |
| 66 | { data: 3, priority: 0 } |
| 67 | ]) |
| 68 | rtSize = priorityQueue.enqueue(1, 1) |
| 69 | expect(priorityQueue.buckets).toBe(1) |
| 70 | expect(priorityQueue.size).toBe(5) |
| 71 | expect(priorityQueue.maxSize).toBe(5) |
| 72 | expect(rtSize).toBe(priorityQueue.size) |
| 73 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 74 | { data: 3, priority: -1 }, |
| 75 | { data: 1, priority: 0 }, |
| 76 | { data: 2, priority: 0 }, |
| 77 | { data: 3, priority: 0 }, |
| 78 | { data: 1, priority: 1 } |
| 79 | ]) |
| 80 | }) |
| 81 | |
| 82 | it('Verify bucketSize=2 enqueue() behavior', () => { |
| 83 | const priorityQueue = new PriorityQueue(2) |
| 84 | let rtSize = priorityQueue.enqueue(1) |
| 85 | expect(priorityQueue.buckets).toBe(0) |
| 86 | expect(priorityQueue.size).toBe(1) |
| 87 | expect(priorityQueue.maxSize).toBe(1) |
| 88 | expect(rtSize).toBe(priorityQueue.size) |
| 89 | expect(priorityQueue.nodeArray).toStrictEqual([{ data: 1, priority: 0 }]) |
| 90 | rtSize = priorityQueue.enqueue(2) |
| 91 | expect(priorityQueue.buckets).toBe(1) |
| 92 | expect(priorityQueue.size).toBe(2) |
| 93 | expect(priorityQueue.maxSize).toBe(2) |
| 94 | expect(rtSize).toBe(priorityQueue.size) |
| 95 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 96 | { data: 1, priority: 0 }, |
| 97 | { data: 2, priority: 0 } |
| 98 | ]) |
| 99 | rtSize = priorityQueue.enqueue(3) |
| 100 | expect(priorityQueue.buckets).toBe(1) |
| 101 | expect(priorityQueue.size).toBe(3) |
| 102 | expect(priorityQueue.maxSize).toBe(3) |
| 103 | expect(rtSize).toBe(priorityQueue.size) |
| 104 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 105 | { data: 1, priority: 0 }, |
| 106 | { data: 2, priority: 0 }, |
| 107 | { data: 3, priority: 0 } |
| 108 | ]) |
| 109 | rtSize = priorityQueue.enqueue(3, -1) |
| 110 | expect(priorityQueue.buckets).toBe(2) |
| 111 | expect(priorityQueue.size).toBe(4) |
| 112 | expect(priorityQueue.maxSize).toBe(4) |
| 113 | expect(rtSize).toBe(priorityQueue.size) |
| 114 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 115 | { data: 1, priority: 0 }, |
| 116 | { data: 2, priority: 0 }, |
| 117 | { data: 3, priority: -1 }, |
| 118 | { data: 3, priority: 0 } |
| 119 | ]) |
| 120 | rtSize = priorityQueue.enqueue(1, 1) |
| 121 | expect(priorityQueue.buckets).toBe(2) |
| 122 | expect(priorityQueue.size).toBe(5) |
| 123 | expect(priorityQueue.maxSize).toBe(5) |
| 124 | expect(rtSize).toBe(priorityQueue.size) |
| 125 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 126 | { data: 1, priority: 0 }, |
| 127 | { data: 2, priority: 0 }, |
| 128 | { data: 3, priority: -1 }, |
| 129 | { data: 3, priority: 0 }, |
| 130 | { data: 1, priority: 1 } |
| 131 | ]) |
| 132 | rtSize = priorityQueue.enqueue(3, -2) |
| 133 | expect(priorityQueue.buckets).toBe(3) |
| 134 | expect(priorityQueue.size).toBe(6) |
| 135 | expect(priorityQueue.maxSize).toBe(6) |
| 136 | expect(rtSize).toBe(priorityQueue.size) |
| 137 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 138 | { data: 1, priority: 0 }, |
| 139 | { data: 2, priority: 0 }, |
| 140 | { data: 3, priority: -1 }, |
| 141 | { data: 3, priority: 0 }, |
| 142 | { data: 3, priority: -2 }, |
| 143 | { data: 1, priority: 1 } |
| 144 | ]) |
| 145 | }) |
| 146 | |
| 147 | it('Verify default bucketSize dequeue() behavior', () => { |
| 148 | const priorityQueue = new PriorityQueue() |
| 149 | priorityQueue.enqueue(1) |
| 150 | priorityQueue.enqueue(2, -1) |
| 151 | priorityQueue.enqueue(3) |
| 152 | expect(priorityQueue.buckets).toBe(1) |
| 153 | expect(priorityQueue.size).toBe(3) |
| 154 | expect(priorityQueue.maxSize).toBe(3) |
| 155 | let rtItem = priorityQueue.dequeue() |
| 156 | expect(priorityQueue.buckets).toBe(1) |
| 157 | expect(priorityQueue.size).toBe(2) |
| 158 | expect(priorityQueue.maxSize).toBe(3) |
| 159 | expect(rtItem).toBe(2) |
| 160 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 161 | { data: 1, priority: 0 }, |
| 162 | { data: 3, priority: 0 } |
| 163 | ]) |
| 164 | rtItem = priorityQueue.dequeue() |
| 165 | expect(priorityQueue.buckets).toBe(1) |
| 166 | expect(priorityQueue.size).toBe(1) |
| 167 | expect(priorityQueue.maxSize).toBe(3) |
| 168 | expect(rtItem).toBe(1) |
| 169 | expect(priorityQueue.nodeArray).toStrictEqual([{ data: 3, priority: 0 }]) |
| 170 | rtItem = priorityQueue.dequeue() |
| 171 | expect(priorityQueue.buckets).toBe(1) |
| 172 | expect(priorityQueue.size).toBe(0) |
| 173 | expect(priorityQueue.maxSize).toBe(3) |
| 174 | expect(rtItem).toBe(3) |
| 175 | expect(priorityQueue.nodeArray).toStrictEqual([]) |
| 176 | }) |
| 177 | |
| 178 | it('Verify bucketSize=2 dequeue() behavior', () => { |
| 179 | const priorityQueue = new PriorityQueue(2) |
| 180 | priorityQueue.enqueue(1) |
| 181 | priorityQueue.enqueue(2) |
| 182 | priorityQueue.enqueue(3) |
| 183 | priorityQueue.enqueue(3, -1) |
| 184 | priorityQueue.enqueue(1, 1) |
| 185 | priorityQueue.enqueue(3, -2) |
| 186 | expect(priorityQueue.buckets).toBe(3) |
| 187 | expect(priorityQueue.size).toBe(6) |
| 188 | expect(priorityQueue.maxSize).toBe(6) |
| 189 | let rtItem = priorityQueue.dequeue(3) |
| 190 | expect(priorityQueue.buckets).toBe(2) |
| 191 | expect(priorityQueue.size).toBe(5) |
| 192 | expect(priorityQueue.maxSize).toBe(6) |
| 193 | expect(rtItem).toBe(3) |
| 194 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 195 | { data: 1, priority: 0 }, |
| 196 | { data: 2, priority: 0 }, |
| 197 | { data: 3, priority: -1 }, |
| 198 | { data: 3, priority: 0 }, |
| 199 | { data: 1, priority: 1 } |
| 200 | ]) |
| 201 | rtItem = priorityQueue.dequeue() |
| 202 | expect(priorityQueue.buckets).toBe(2) |
| 203 | expect(priorityQueue.size).toBe(4) |
| 204 | expect(priorityQueue.maxSize).toBe(6) |
| 205 | expect(rtItem).toBe(1) |
| 206 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 207 | { data: 2, priority: 0 }, |
| 208 | { data: 3, priority: -1 }, |
| 209 | { data: 3, priority: 0 }, |
| 210 | { data: 1, priority: 1 } |
| 211 | ]) |
| 212 | rtItem = priorityQueue.dequeue(2) |
| 213 | expect(priorityQueue.buckets).toBe(1) |
| 214 | expect(priorityQueue.size).toBe(3) |
| 215 | expect(priorityQueue.maxSize).toBe(6) |
| 216 | expect(rtItem).toBe(3) |
| 217 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 218 | { data: 2, priority: 0 }, |
| 219 | { data: 3, priority: -1 }, |
| 220 | { data: 1, priority: 1 } |
| 221 | ]) |
| 222 | rtItem = priorityQueue.dequeue(2) |
| 223 | expect(priorityQueue.buckets).toBe(1) |
| 224 | expect(priorityQueue.size).toBe(2) |
| 225 | expect(priorityQueue.maxSize).toBe(6) |
| 226 | expect(rtItem).toBe(1) |
| 227 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 228 | { data: 2, priority: 0 }, |
| 229 | { data: 3, priority: -1 } |
| 230 | ]) |
| 231 | rtItem = priorityQueue.dequeue(2) |
| 232 | expect(priorityQueue.buckets).toBe(0) |
| 233 | expect(priorityQueue.size).toBe(1) |
| 234 | expect(priorityQueue.maxSize).toBe(6) |
| 235 | expect(rtItem).toBe(2) |
| 236 | expect(priorityQueue.nodeArray).toStrictEqual([{ data: 3, priority: -1 }]) |
| 237 | rtItem = priorityQueue.dequeue() |
| 238 | expect(priorityQueue.buckets).toBe(0) |
| 239 | expect(priorityQueue.size).toBe(0) |
| 240 | expect(priorityQueue.maxSize).toBe(6) |
| 241 | expect(rtItem).toBe(3) |
| 242 | expect(priorityQueue.nodeArray).toStrictEqual([]) |
| 243 | }) |
| 244 | |
| 245 | it('Verify peekFirst() behavior', () => { |
| 246 | const priorityQueue = new PriorityQueue() |
| 247 | priorityQueue.enqueue(1) |
| 248 | priorityQueue.enqueue(2) |
| 249 | priorityQueue.enqueue(3) |
| 250 | expect(priorityQueue.size).toBe(3) |
| 251 | expect(priorityQueue.peekFirst()).toBe(1) |
| 252 | expect(priorityQueue.size).toBe(3) |
| 253 | }) |
| 254 | |
| 255 | it('Verify peekLast() behavior', () => { |
| 256 | const priorityQueue = new PriorityQueue() |
| 257 | priorityQueue.enqueue(1) |
| 258 | priorityQueue.enqueue(2) |
| 259 | priorityQueue.enqueue(3) |
| 260 | expect(priorityQueue.size).toBe(3) |
| 261 | expect(priorityQueue.peekLast()).toBe(3) |
| 262 | expect(priorityQueue.size).toBe(3) |
| 263 | }) |
| 264 | |
| 265 | it('Verify iterator behavior', () => { |
| 266 | const priorityQueue = new PriorityQueue() |
| 267 | priorityQueue.enqueue(1) |
| 268 | priorityQueue.enqueue(2) |
| 269 | priorityQueue.enqueue(3) |
| 270 | let i = 1 |
| 271 | for (const value of priorityQueue) { |
| 272 | expect(value).toBe(i) |
| 273 | ++i |
| 274 | } |
| 275 | }) |
| 276 | |
| 277 | it('Verify clear() behavior', () => { |
| 278 | const priorityQueue = new PriorityQueue() |
| 279 | priorityQueue.enqueue(1) |
| 280 | priorityQueue.enqueue(2) |
| 281 | priorityQueue.enqueue(3) |
| 282 | expect(priorityQueue.buckets).toBe(1) |
| 283 | expect(priorityQueue.size).toBe(3) |
| 284 | expect(priorityQueue.maxSize).toBe(3) |
| 285 | expect(priorityQueue.nodeArray).toStrictEqual([ |
| 286 | { data: 1, priority: 0 }, |
| 287 | { data: 2, priority: 0 }, |
| 288 | { data: 3, priority: 0 } |
| 289 | ]) |
| 290 | priorityQueue.clear() |
| 291 | expect(priorityQueue.buckets).toBe(1) |
| 292 | expect(priorityQueue.size).toBe(0) |
| 293 | expect(priorityQueue.maxSize).toBe(0) |
| 294 | expect(priorityQueue.nodeArray).toStrictEqual([]) |
| 295 | }) |
| 296 | }) |