remoting/webapp/browser_test/timeout_waiter.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview
   7  * Provide polling-based "wait for" functionality, and defines some useful
   8  * predicates.
   9  */
  10
  11 'use strict';
  12
  13 /** @suppress {duplicate} */
  14 var browserTest = browserTest || {};
  15
  16 /** @enum {number} */
  17 browserTest.Timeout = {
  18   NONE: -1,
  19   DEFAULT: 5000
  20 };
  21
  22 /** @constructor */
  23 browserTest.Predicate = function() {};
  24
  25 /** @return {boolean} */
  26 browserTest.Predicate.prototype.evaluate = function() {};
  27
  28 /** @return {string} */
  29 browserTest.Predicate.prototype.description = function() {};
  30
  31 /**
  32  * @param {browserTest.Predicate} predicate
  33  * @param {number=} opt_timeout Timeout in ms.
  34  * @return {Promise}
  35  */
  36 browserTest.waitFor = function(predicate, opt_timeout) {
  37   return new Promise(
  38       /**
  39        * @param {function(boolean):void} fulfill
  40        * @param {function(Error):void} reject
  41        */
  42       function (fulfill, reject) {
  43         if (opt_timeout === undefined) {
  44           opt_timeout = browserTest.Timeout.DEFAULT;
  45         }
  46
  47         var timeout = /** @type {number} */ (opt_timeout);
  48         var end = Number(Date.now()) + timeout;
  49         var testPredicate = function() {
  50           if (predicate.evaluate()) {
  51             console.log(predicate.description() + ' satisfied.');
  52             fulfill(true);
  53           } else if (Date.now() >= end) {
  54             reject(new Error('Timed out (' + opt_timeout + 'ms) waiting for ' +
  55                              predicate.description()));
  56           } else {
  57             console.log(predicate.description() + ' not yet satisfied.');
  58             window.setTimeout(testPredicate, 500);
  59           }
  60         };
  61         testPredicate();
  62       });
  63 };
  64
  65 /**
  66  * @param {string} id
  67  * @return {browserTest.Predicate}
  68  */
  69 browserTest.isVisible = function(id) {
  70   var pred = new browserTest.Predicate();
  71   pred.evaluate = function() {
  72     /** @type {HTMLElement} */
  73     var element = document.getElementById(id);
  74     browserTest.expect(Boolean(element), 'No such element: ' + id);
  75     return element.getBoundingClientRect().width !== 0;
  76   };
  77   pred.description = function() {
  78     return 'isVisible(' + id + ')';
  79   };
  80   return pred;
  81 };
  82
  83 /**
  84  * @param {string} id
  85  * @return {browserTest.Predicate}
  86  */
  87 browserTest.isEnabled = function(id) {
  88   var pred = new browserTest.Predicate();
  89   pred.evaluate = function() {
  90     /** @type {Element} */
  91     var element = document.getElementById(id);
  92     browserTest.expect(Boolean(element), 'No such element: ' + id);
  93     return !element.disabled;
  94   };
  95   pred.description = function() {
  96     return 'isEnabled(' + id + ')';
  97   };
  98   return pred;
  99 };