test_SpecialPowersSpawn.html

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<!DOCTYPE HTML>

<html>

<head>

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

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

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

</head>

<body>

<iframe id="iframe"></iframe>

<span id="hello">World.</span>

<script>

/* globals SpecialPowers, content */

  add_task(async function() {

    let frame = document.getElementById("iframe");

    frame.src = "https://example.com/tests/testing/mochitest/tests/Harness_sanity/file_spawn.html";

    await new Promise(resolve => {

      frame.addEventListener("load", resolve, {once: true});

});

    let result = await SpecialPowers.spawn(frame, ["#span"], selector => {

      let elem = content.document.querySelector(selector);

      return elem.textContent;

});

    is(result, "Hello there.", "Got correct element text from frame");

    /* eslint-disable no-shadow */

    result = await SpecialPowers.spawn(frame, ["#hello"], selector => {

      return SpecialPowers.spawn(content.parent, [selector], selector => {

        let elem = content.document.querySelector(selector);

        return elem.textContent;

});

});

    is(result, "World.", "Got correct element text from frame's window.parent");

    result = await SpecialPowers.spawn(frame.contentWindow, ["#span"], selector => {

      let elem = content.document.querySelector(selector);

      return elem.textContent;

});

    is(result, "Hello there.", "Got correct element text from window proxy");

    result = await SpecialPowers.spawn(SpecialPowers.getPrivilegedProps(frame, "browsingContext"),

                                       ["#span"], selector => {

      let elem = content.document.querySelector(selector);

      return elem.textContent;

});

    is(result, "Hello there.", "Got correct element text from browsing context");

    let line = 58; // Keep this in sync with the line number where the callback function starts.

    let callback = () => {

      let e = new Error("Hello.");

      return { filename: e.fileName, lineNumber: e.lineNumber };

};

    let loc = await SpecialPowers.spawn(frame, [], callback);

    is(loc.filename, location.href, "Error should have correct script filename");

    is(loc.lineNumber, line + 2, "Error should have correct script line number");

});

</script>

</body>

</html>