docs: refine task statistics description

[poolifier.git] / tests / queue.test.js

const { expect } = require('expect')
const { Queue } = require('../lib/queue')

describe('Queue test suite', () => {
  it('Verify enqueue() behavior', () => {
    const queue = new Queue()
    let rtSize = queue.enqueue(1)
    expect(queue.size).toBe(1)
    expect(rtSize).toBe(queue.size)
    expect(queue.head).toBe(0)
    expect(queue.tail).toBe(1)
    expect(queue.max).toBe(1)
    expect(queue.items).toStrictEqual({ 0: 1 })
    rtSize = queue.enqueue(2)
    expect(queue.size).toBe(2)
    expect(rtSize).toBe(queue.size)
    expect(queue.head).toBe(0)
    expect(queue.tail).toBe(2)
    expect(queue.max).toBe(2)
    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.max).toBe(3)
    expect(queue.items).toStrictEqual({ 0: 1, 1: 2, 2: 3 })
  })

  it('Verify dequeue() behavior', () => {
    const queue = new Queue()
    queue.enqueue(1)
    queue.enqueue(2)
    queue.enqueue(3)
    let rtItem = queue.dequeue()
    expect(queue.size).toBe(2)
    expect(rtItem).toBe(1)
    expect(queue.head).toBe(1)
    expect(queue.tail).toBe(3)
    expect(queue.max).toBe(3)
    expect(queue.items).toStrictEqual({ 1: 2, 2: 3 })
    rtItem = queue.dequeue()
    expect(queue.size).toBe(1)
    expect(rtItem).toBe(2)
    expect(queue.head).toBe(2)
    expect(queue.tail).toBe(3)
    expect(queue.max).toBe(3)
    expect(queue.items).toStrictEqual({ 2: 3 })
    rtItem = queue.dequeue()
    expect(queue.size).toBe(0)
    expect(rtItem).toBe(3)
    expect(queue.head).toBe(0)
    expect(queue.tail).toBe(0)
    expect(queue.max).toBe(3)
    expect(queue.items).toStrictEqual({})
  })
})