chrome/browser/resources/chromeos/chromevox/testing/assert_additions.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  * Asserts that a given argument's value is undefined.
   7  * @param {object} a The argument to check.
   8  */
   9 function assertUndefined(a) {
  10   if (a !== undefined) {
  11     throw new Error('Assertion failed: expected undefined');
  12   }
  13 }
  14
  15 /**
  16  * Asserts that the argument is neither null nor undefined.
  17  * @param {object} obj The argument to check.
  18  * @param {string=} opt_message Error message if the condition is not met.
  19  */
  20 function assertNotNullNorUndefined(obj, opt_message) {
  21   if (obj === undefined || obj === null) {
  22     throw new Error('Can\'t be null or undefined: ' + (opt_message || '') +
  23         '\n' + 'Actual: ' + obj);
  24   }
  25 }
  26
  27 /**
  28  * Asserts that a given function call throws an exception.
  29  * @param {string} msg Message to print if exception not thrown.
  30  * @param {Function} fn The function to call.
  31  * @param {string} error The name of the exception we expect {@code fn} to
  32  *     throw.
  33  */
  34 function assertException(msg, fn, error) {
  35   try {
  36     fn();
  37   } catch (e) {
  38     if (error && e.name != error) {
  39       throw new Error('Expected to throw ' + error + ' but threw ' + e.name +
  40           ' - ' + msg);
  41     }
  42     return;
  43   }
  44
  45   throw new Error('Expected to throw exception ' + error + ' - ' + msg);
  46 }
  47
  48 /**
  49  * Asserts that two arrays of strings are equal.
  50  * @param {Array<string>} array1 The expected array.
  51  * @param {Array<string>} array2 The test array.
  52  */
  53 function assertEqualStringArrays(array1, array2) {
  54   var same = true;
  55   if (array1.length != array2.length) {
  56     same = false;
  57   }
  58   for (var i = 0; i < Math.min(array1.length, array2.length); i++) {
  59     if (array1[i].trim() != array2[i].trim()) {
  60       same = false;
  61     }
  62   }
  63   if (!same) {
  64     throw new Error('Expected ' + JSON.stringify(array1) +
  65                     ', got ' + JSON.stringify(array2));
  66   }
  67 }
  68
  69 /**
  70  * Asserts that two objects have the same JSON serialization.
  71  * @param {Object} expected The expected object.
  72  * @param {Object} actual The actual object.
  73  * @param {string=} opt_message Message used for errors.
  74  */
  75 function assertEqualsJSON(expected, actual, opt_message) {
  76   if (JSON.stringify(actual) !== JSON.stringify(expected)) {
  77     throw new Error((opt_message ? opt_message + '\n' : '') +
  78         'Expected ' + JSON.stringify(expected) + '\n' +
  79         'Got      ' + JSON.stringify(actual));
  80   }
  81 }
  82
  83 assertSame = assertEquals;
  84 assertNotSame = assertNotEquals;