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var DLList = require('../lib/DLList')
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var assert = require('assert')
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var c = require('./context')({datastore: 'local'})
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var fakeQueues = function () {
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this._length = 0
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this.incr = () => this._length++
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this.decr = () => this._length--
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}
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describe('DLList', function () {
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it('Should be created and be empty', function () {
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var list = new DLList(new fakeQueues())
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c.mustEqual(list.getArray().length, 0)
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})
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it('Should be possible to append once', function () {
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var list = new DLList(new fakeQueues())
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list.push(5)
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var arr = list.getArray()
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c.mustEqual(arr.length, 1)
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c.mustEqual(list.length, 1)
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c.mustEqual(list._queues._length, 1)
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c.mustEqual(arr[0], 5)
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})
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it('Should be possible to append multiple times', function () {
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var list = new DLList(new fakeQueues())
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list.push(5)
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list.push(6)
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var arr = list.getArray()
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c.mustEqual(arr.length, 2)
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c.mustEqual(list.length, 2)
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c.mustEqual(list._queues._length, 2)
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c.mustEqual(arr[0], 5)
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c.mustEqual(arr[1], 6)
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list.push(10)
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arr = list.getArray()
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c.mustEqual(arr.length, 3)
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c.mustEqual(list.length, 3)
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c.mustEqual(arr[0], 5)
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c.mustEqual(arr[1], 6)
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c.mustEqual(arr[2], 10)
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})
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it('Should be possible to shift an empty list', function () {
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var list = new DLList(new fakeQueues())
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c.mustEqual(list.length, 0)
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assert(list.shift() === undefined)
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var arr = list.getArray()
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c.mustEqual(arr.length, 0)
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c.mustEqual(list.length, 0)
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assert(list.shift() === undefined)
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arr = list.getArray()
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c.mustEqual(arr.length, 0)
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c.mustEqual(list.length, 0)
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c.mustEqual(list._queues._length, 0)
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})
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it('Should be possible to append then shift once', function () {
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var list = new DLList(new fakeQueues())
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list.push(5)
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c.mustEqual(list.length, 1)
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c.mustEqual(list.shift(), 5)
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var arr = list.getArray()
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c.mustEqual(arr.length, 0)
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c.mustEqual(list.length, 0)
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c.mustEqual(list._queues._length, 0)
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})
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it('Should be possible to append then shift multiple times', function () {
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var list = new DLList(new fakeQueues())
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list.push(5)
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c.mustEqual(list.length, 1)
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c.mustEqual(list.shift(), 5)
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c.mustEqual(list.length, 0)
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list.push(6)
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c.mustEqual(list.length, 1)
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c.mustEqual(list.shift(), 6)
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c.mustEqual(list.length, 0)
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c.mustEqual(list._queues._length, 0)
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})
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it('Should pass a full test', function () {
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var list = new DLList(new fakeQueues())
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list.push(10)
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c.mustEqual(list.length, 1)
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list.push("11")
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c.mustEqual(list.length, 2)
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list.push(12)
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c.mustEqual(list.length, 3)
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c.mustEqual(list._queues._length, 3)
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c.mustEqual(list.shift(), 10)
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c.mustEqual(list.length, 2)
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c.mustEqual(list.shift(),"11")
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c.mustEqual(list.length, 1)
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list.push(true)
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c.mustEqual(list.length, 2)
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var arr = list.getArray()
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c.mustEqual(arr[0], 12)
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c.mustEqual(arr[1], true)
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c.mustEqual(arr.length, 2)
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c.mustEqual(list._queues._length, 2)
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})
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it('Should return the first value without shifting', function () {
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var list = new DLList(new fakeQueues())
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assert(list.first() === undefined)
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assert(list.first() === undefined)
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list.push(1)
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c.mustEqual(list.first(), 1)
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c.mustEqual(list.first(), 1)
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list.push(2)
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c.mustEqual(list.first(), 1)
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c.mustEqual(list.first(), 1)
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c.mustEqual(list.shift(), 1)
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c.mustEqual(list.first(), 2)
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c.mustEqual(list.first(), 2)
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c.mustEqual(list.shift(), 2)
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assert(list.first() === undefined)
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assert(list.first() === undefined)
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assert(list.first() === undefined)
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assert(list.shift() === undefined)
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assert(list.first() === undefined)
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})
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})
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