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/* globals describe, expect, it */
import { Queue } from '../../../src/main.js'
describe('Queue.js', function () {
describe('first ()', function () {
it('returns null if no item in the queue', function () {
var queue = new Queue()
expect(queue.first()).toEqual(null)
})
it('returns the first value in the queue', function () {
var queue = new Queue()
queue.push(1)
expect(queue.first()).toBe(1)
queue.push(2)
expect(queue.first()).toBe(1)
})
})
describe('last ()', function () {
it('returns null if no item in the queue', function () {
var queue = new Queue()
expect(queue.last()).toEqual(null)
})
it('returns the last value added', function () {
var queue = new Queue()
queue.push(1)
expect(queue.last()).toBe(1)
queue.push(2)
expect(queue.last()).toBe(2)
})
})
describe('push ()', function () {
it('adds an element to the end of the queue', function () {
var queue = new Queue()
queue.push(1)
queue.push(2)
queue.push(3)
expect(queue.first()).toBe(1)
expect(queue.last()).toBe(3)
})
it('adds an item to the end of the queue', function () {
var queue = new Queue()
queue.push(1)
const item = queue.push(2)
queue.push(3)
queue.remove(item)
queue.push(item)
expect(queue.first()).toBe(1)
expect(queue.last()).toBe(2)
})
})
describe('remove ()', function () {
it('removes the given item from the queue', function () {
var queue = new Queue()
queue.push(1)
queue.push(2)
var item = queue.push(3)
queue.remove(item)
expect(queue.last()).toBe(2)
expect(queue.first()).toBe(1)
})
it('removes the given item from the queue', function () {
var queue = new Queue()
var item = queue.push(1)
queue.push(2)
queue.push(3)
queue.remove(item)
expect(queue.last()).toBe(3)
expect(queue.first()).toBe(2)
})
})
describe('shift ()', function () {
it('returns nothing if queue is empty', function () {
var queue = new Queue()
var val = queue.shift()
expect(val).toBeFalsy()
})
it('returns the first item of the queue and removes it', function () {
var queue = new Queue()
queue.push(1)
queue.push(2)
queue.push(3)
var val = queue.shift()
expect(queue.last()).toBe(3)
expect(queue.first()).toBe(2)
expect(val).toBe(1)
})
})
})
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