test_webglcontextcreationerror.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset='UTF-8'>

  <script src='/tests/SimpleTest/SimpleTest.js'></script>

  <link rel='stylesheet' href='/tests/SimpleTest/test.css'>

</head>

<body>

<script>

'use strict';

function RunWithPrefs(prefPairList, func) {

  var prefEnv = {'set': prefPairList};

  try {

    SpecialPowers.pushPrefEnv(prefEnv, func);

  } catch (e) {

    console.log('Warning: Failed to set prefs: ' + JSON.stringify(prefPairList));

    func();

////////////////////////////////////////

function Check(expr, text) {

  ok(expr, text);

  return expr;

function TestWhenDisabled() {

  var c = document.createElement('canvas');

  var generatedEvent = null;

  var f = function(event) { generatedEvent = event; };

  c.addEventListener('webglcontextcreationerror', f);

  var gl = c.getContext('webgl'); // Should fail.

  do {

    if (!Check(!gl, 'When disabled, context creation should fail.'))

      break;

    if (!Check(generatedEvent, 'Context creation failure should generate an event.'))

      break;

    var reason = generatedEvent.statusMessage;

    if (!Check(reason !== undefined, 'generatedEvent.statusMessage should be defined.'))

      break;

    ok(reason.length, 'statusMessage should be non-empty.');

  } while (false);

  SimpleTest.finish();

////////////////////////////////////////

SimpleTest.waitForExplicitFinish();

var prefPairList = [

  ['webgl.disabled', true],

];

RunWithPrefs(prefPairList, TestWhenDisabled);

</script>

</body>

</html>