test_prefOnConstructor.html

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<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=1604340

-->

<head>

  <meta charset="utf-8">

  <title>Test for Bug 1604340</title>

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

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

  <script type="application/javascript">

  /* global WrapperCachedNonISupportsTestInterface */

  SimpleTest.waitForExplicitFinish();

  SpecialPowers.pushPrefEnv({set: [["dom.expose_test_interfaces", true]]}, go);

  async function go() {

    await SpecialPowers.pushPrefEnv({set: [["dom.webidl.test1", false]]});

    let result = null;

    let constructorThrew = false;

    try {

      result = new WrapperCachedNonISupportsTestInterface();

    } catch {

      constructorThrew = true;

    is(result, null, "The result value should remain null if the constructor threw an exception as intended.");

    ok(constructorThrew, "The constructor should throw an exception if its pref is not set to true.");

    await SpecialPowers.pushPrefEnv({set: [["dom.webidl.test1", true]]});

    result = null;

    constructorThrew = false;

    try {

      result = new WrapperCachedNonISupportsTestInterface();

    } catch {

      constructorThrew = true;

    isnot(result, null, "Constructor should have executed successfully.");

    ok(!constructorThrew, "The constructor should not throw an exception if its pref is set.");

    SimpleTest.finish();

  </script>

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1604340">Mozilla Bug 1604340</a>

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

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

</div>

<pre id="test">

</pre>

</body>

</html>