queue/test/index.js at 5098a10bfb8b30f4adab4a93066ee93d031e0c45 · then/queue · GitHub

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'use strict';

var assert = require('assert')
var test = require('testit')
var Queue = require('../')

test('queue', function () {
  var q = new Queue();
  var results = [];
  assert(q.length === 0);
  q.push(1);
  assert(q.length === 1);
  q.push(2);
  assert(q.length === 2);
  q.push(3);
  assert(q.length === 3);
  return q.shift().then(function (n) {
    assert(n === 1);
    assert(q.length === 2);
    return q.shift();
  }).then(function (n) {
    assert(n === 2);
    assert(q.length === 1);
    return q.shift();
  }).then(function (n) {
    assert(n === 3);
    assert(q.length === 0);
    results.push(q.shift());
    assert(q.length === -1);
    results.push(q.shift());
    assert(q.length === -2);
    results.push(q.shift());
    assert(q.length === -3);
    q.push(1);
    assert(q.length === -2);
    return results.shift();
  }).then(function (n) {
    assert(n === 1);
    q.push(2);
    assert(q.length === -1);
    return results.shift();
  }).then(function (n) {
    assert(n === 2);
    q.push(3);
    assert(q.length === 0);
    return results.shift();
  }).then(function (n) {
    assert(n === 3);
  });
});