dom/canvas/test/webgl-mochitest/test_webglcontextcreationerror.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4   <meta charset='UTF-8'>
   5   <script src='/tests/SimpleTest/SimpleTest.js'></script>
   6   <link rel='stylesheet' href='/tests/SimpleTest/test.css'>
   7 </head>
   8 <body>
   9 <script>
  10 'use strict';
  11
  12 function RunWithPrefs(prefPairList, func) {
  13   var prefEnv = {'set': prefPairList};
  14   try {
  15     SpecialPowers.pushPrefEnv(prefEnv, func);
  16   } catch (e) {
  17     console.log('Warning: Failed to set prefs: ' + JSON.stringify(prefPairList));
  18     func();
  19   }
  20 }
  21
  22 ////////////////////////////////////////
  23
  24 function Check(expr, text) {
  25   ok(expr, text);
  26   return expr;
  27 }
  28
  29 function TestWhenDisabled() {
  30   var c = document.createElement('canvas');
  31
  32   var generatedEvent = null;
  33   var f = function(event) { generatedEvent = event; };
  34   c.addEventListener('webglcontextcreationerror', f);
  35
  36   var gl = c.getContext('webgl'); // Should fail.
  37
  38   do {
  39     if (!Check(!gl, 'When disabled, context creation should fail.'))
  40       break;
  41
  42     if (!Check(generatedEvent, 'Context creation failure should generate an event.'))
  43       break;
  44
  45     var reason = generatedEvent.statusMessage;
  46     if (!Check(reason !== undefined, 'generatedEvent.statusMessage should be defined.'))
  47       break;
  48
  49     ok(reason.length, 'statusMessage should be non-empty.');
  50   } while (false);
  51
  52   SimpleTest.finish();
  53 }
  54
  55 ////////////////////////////////////////
  56
  57 SimpleTest.waitForExplicitFinish();
  58
  59 var prefPairList = [
  60   ['webgl.disabled', true],
  61 ];
  62 RunWithPrefs(prefPairList, TestWhenDisabled);
  63
  64 </script>
  65 </body>
  66 </html>