| 1 | const { expect } = require('expect') |
| 2 | const { Deque } = require('../lib/deque') |
| 3 | |
| 4 | describe('Deque test suite', () => { |
| 5 | it('Verify push() behavior', () => { |
| 6 | const deque = new Deque() |
| 7 | let rtSize = deque.push(1) |
| 8 | expect(deque.size).toBe(1) |
| 9 | expect(deque.maxSize).toBe(1) |
| 10 | expect(rtSize).toBe(deque.size) |
| 11 | expect(deque.head).toMatchObject({ value: 1 }) |
| 12 | expect(deque.tail).toMatchObject({ value: 1 }) |
| 13 | rtSize = deque.push(2) |
| 14 | expect(deque.size).toBe(2) |
| 15 | expect(deque.maxSize).toBe(2) |
| 16 | expect(rtSize).toBe(deque.size) |
| 17 | expect(deque.head).toMatchObject({ value: 1 }) |
| 18 | expect(deque.tail).toMatchObject({ value: 2 }) |
| 19 | rtSize = deque.push(3) |
| 20 | expect(deque.size).toBe(3) |
| 21 | expect(deque.maxSize).toBe(3) |
| 22 | expect(rtSize).toBe(deque.size) |
| 23 | expect(deque.head).toMatchObject({ value: 1 }) |
| 24 | expect(deque.tail).toMatchObject({ value: 3 }) |
| 25 | }) |
| 26 | |
| 27 | it('Verify unshift() behavior', () => { |
| 28 | const deque = new Deque() |
| 29 | let rtSize = deque.unshift(1) |
| 30 | expect(deque.size).toBe(1) |
| 31 | expect(deque.maxSize).toBe(1) |
| 32 | expect(rtSize).toBe(deque.size) |
| 33 | expect(deque.head).toMatchObject({ value: 1 }) |
| 34 | expect(deque.tail).toMatchObject({ value: 1 }) |
| 35 | rtSize = deque.unshift(2) |
| 36 | expect(deque.size).toBe(2) |
| 37 | expect(deque.maxSize).toBe(2) |
| 38 | expect(rtSize).toBe(deque.size) |
| 39 | expect(deque.head).toMatchObject({ value: 2 }) |
| 40 | expect(deque.tail).toMatchObject({ value: 1 }) |
| 41 | rtSize = deque.unshift(3) |
| 42 | expect(deque.size).toBe(3) |
| 43 | expect(deque.maxSize).toBe(3) |
| 44 | expect(rtSize).toBe(deque.size) |
| 45 | expect(deque.head).toMatchObject({ value: 3 }) |
| 46 | expect(deque.tail).toMatchObject({ value: 1 }) |
| 47 | }) |
| 48 | |
| 49 | it('Verify pop() behavior', () => { |
| 50 | const deque = new Deque() |
| 51 | deque.push(1) |
| 52 | deque.push(2) |
| 53 | deque.push(3) |
| 54 | let rtItem = deque.pop() |
| 55 | expect(deque.size).toBe(2) |
| 56 | expect(deque.maxSize).toBe(3) |
| 57 | expect(rtItem).toBe(3) |
| 58 | expect(deque.head).toMatchObject({ value: 1 }) |
| 59 | expect(deque.tail).toMatchObject({ value: 2 }) |
| 60 | rtItem = deque.pop() |
| 61 | expect(deque.size).toBe(1) |
| 62 | expect(deque.maxSize).toBe(3) |
| 63 | expect(rtItem).toBe(2) |
| 64 | expect(deque.head).toMatchObject({ value: 1 }) |
| 65 | expect(deque.tail).toMatchObject({ value: 1 }) |
| 66 | rtItem = deque.pop() |
| 67 | expect(deque.size).toBe(0) |
| 68 | expect(deque.maxSize).toBe(3) |
| 69 | expect(rtItem).toBe(1) |
| 70 | expect(deque.head).toBeUndefined() |
| 71 | expect(deque.tail).toBeUndefined() |
| 72 | }) |
| 73 | |
| 74 | it('Verify shift() behavior', () => { |
| 75 | const deque = new Deque() |
| 76 | deque.push(1) |
| 77 | deque.push(2) |
| 78 | deque.push(3) |
| 79 | let rtItem = deque.shift() |
| 80 | expect(deque.size).toBe(2) |
| 81 | expect(deque.maxSize).toBe(3) |
| 82 | expect(rtItem).toBe(1) |
| 83 | expect(deque.head).toMatchObject({ value: 2 }) |
| 84 | expect(deque.tail).toMatchObject({ value: 3 }) |
| 85 | rtItem = deque.shift() |
| 86 | expect(deque.size).toBe(1) |
| 87 | expect(deque.maxSize).toBe(3) |
| 88 | expect(rtItem).toBe(2) |
| 89 | expect(deque.head).toMatchObject({ value: 3 }) |
| 90 | expect(deque.tail).toMatchObject({ value: 3 }) |
| 91 | rtItem = deque.shift() |
| 92 | expect(deque.size).toBe(0) |
| 93 | expect(deque.maxSize).toBe(3) |
| 94 | expect(rtItem).toBe(3) |
| 95 | expect(deque.head).toBeUndefined() |
| 96 | expect(deque.tail).toBeUndefined() |
| 97 | }) |
| 98 | |
| 99 | it('Verify clear() behavior', () => { |
| 100 | const deque = new Deque() |
| 101 | deque.push(1) |
| 102 | deque.push(2) |
| 103 | deque.push(3) |
| 104 | expect(deque.size).toBe(3) |
| 105 | expect(deque.maxSize).toBe(3) |
| 106 | expect(deque.head).toMatchObject({ value: 1 }) |
| 107 | expect(deque.tail).toMatchObject({ value: 3 }) |
| 108 | deque.clear() |
| 109 | expect(deque.size).toBe(0) |
| 110 | expect(deque.maxSize).toBe(0) |
| 111 | expect(deque.head).toBeUndefined() |
| 112 | expect(deque.tail).toBeUndefined() |
| 113 | }) |
| 114 | |
| 115 | it('Verify iterator behavior', () => { |
| 116 | const deque = new Deque() |
| 117 | deque.push(1) |
| 118 | deque.push(2) |
| 119 | deque.push(3) |
| 120 | let i = 1 |
| 121 | for (const value of deque) { |
| 122 | expect(value).toBe(i) |
| 123 | ++i |
| 124 | } |
| 125 | }) |
| 126 | |
| 127 | it('Verify backward() iterator behavior', () => { |
| 128 | const deque = new Deque() |
| 129 | deque.push(1) |
| 130 | deque.push(2) |
| 131 | deque.push(3) |
| 132 | let i = deque.size |
| 133 | for (const value of deque.backward()) { |
| 134 | expect(value).toBe(i) |
| 135 | --i |
| 136 | } |
| 137 | }) |
| 138 | }) |