test_SpecialPowersLoadChromeScript.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test for SpecialPowers.loadChromeScript</title>

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

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

</head>

<body>

<pre id="test">

<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();

var url = SimpleTest.getTestFileURL("SpecialPowersLoadChromeScript.js");

var script = SpecialPowers.loadChromeScript(url);

var MESSAGE = { bar: true };

script.addMessageListener("bar", function (message) {

  is(JSON.stringify(message), JSON.stringify(MESSAGE),

     "received back message from the chrome script");

  checkAssert();

});

function checkAssert() {

  script.sendAsyncMessage("valid-assert");

  script.addMessageListener("valid-assert-done", endOfFirstTest);

var script2;

function endOfFirstTest() {

  script.destroy();

  // wantGlobalProperties should add the specified properties to the sandbox

  // that is used to run the chrome script.

  script2 = SpecialPowers.loadChromeScript(_ => {

    /* eslint-env mozilla/chrome-script */

    addMessageListener("valid-assert", function () {

      assert.equal(typeof XMLHttpRequest, "function", "XMLHttpRequest is defined");

      assert.equal(typeof CSS, "undefined", "CSS is not defined");

      sendAsyncMessage("valid-assert-done");

});

  }, { wantGlobalProperties: ["ChromeUtils", "XMLHttpRequest"] });

  script2.sendAsyncMessage("valid-assert");

  script2.addMessageListener("valid-assert-done", endOfTest);

async function endOfTest() {

  is(await script.sendQuery("sync-message"), "Received a synchronous message.",

     "Check sync return value");

  script2.destroy();

  SimpleTest.finish();

script.sendAsyncMessage("foo", MESSAGE);

</script>

</pre>

</body>

</html>