test_sequence_wrapping.html

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<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=775852

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  <meta charset="utf-8">

  <title>Test for Bug 775852</title>

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

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

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<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=775852">Mozilla Bug 775852</a>

<p id="display"></p>

<iframe id="content" style="display: none">

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<pre id="test">

<script type="application/javascript">

/** Test for Bug 775852 **/

function doTest() {

  let win = document.getElementById("content").contentWindow;

  let doc = win.document;

  doc.body.innerHTML = `<canvas width="1" height="1" id="c"></canvas>`;

  let gl = doc.getElementById("c").getContext("experimental-webgl");

  if (!gl) {

    // No WebGL support on MacOS 10.5.  Just skip this test

    todo(false, "WebGL not supported");

    return;

  var setterCalled = false;

  var extLength = gl.getSupportedExtensions().length;

  ok(extLength > 0,

     "This test won't work right if we have no supported extensions");

  win.Object.defineProperty(win.Array.prototype, "0",

      set() {

             setterCalled = true;

},

});

  // Test that our property got defined correctly

  let arr = new win.Array();

  arr[0] = 5;

  is(setterCalled, true, "Setter should be called when setting prop on array");

  setterCalled = false;

  is(gl.getSupportedExtensions().length, extLength,

     "We should still have the same number of extensions");

  is(setterCalled, false,

     "Setter should not be called when getting supported extensions");

doTest();

</script>

</pre>

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