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