test_bug1656248.html

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<!DOCTYPE html>

<html>

<!--

Repeated reload an iframe. When iframe's script is loaded from the bytecode

cache, dynamic module import should still resolve modules based on the

script's URL.

-->

<head>

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

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

  <script>

    const iframeId = "test_iframe";

    var checkResult = null;

    async function startTest() {

      SimpleTest.waitForExplicitFinish();

      // Setting dom.expose_test_interfaces pref causes the

      // nsScriptLoadRequest to fire event on script tags, with information

      // about its internal state. The ScriptLoader source send events to

      // trace these and resolve a promise with the path taken by the

      // script loader.

//

      // Setting dom.script_loader.bytecode_cache.strategy to -1 causes the

      // nsScriptLoadRequest to force all the conditions necessary to make a

      // script be saved as bytecode in the alternate data storage provided

      // by the channel (necko cache).

      await SpecialPowers.pushPrefEnv({

        set: [

          ['dom.script_loader.bytecode_cache.enabled', true],

          ['dom.expose_test_interfaces', true],

          ["dom.script_loader.bytecode_cache.strategy", -1]

        ]});

      for (let i = 0; i < 3; i++) {

        let iframe = document.getElementById(iframeId);

        if (iframe) {

          document.body.removeChild(iframe);

        iframe = document.createElement("iframe");

        document.body.appendChild(iframe);

        iframe.id = iframeId;

        let iwin = iframe.contentWindow;

        let eventPromise = new Promise(resolve => {

          // Both regular script and imported module scripts are encoded/decoded

          // Wait for 2 encode/load events to be fired.

          let count = 0;

          if (i == 0) {

            iwin.addEventListener("scriptloader_bytecode_saved", event => {

              count++;

              ok(true, "Bytecode encoding succeeded");

              if (count == 2) {

                resolve();

});

          } else {

            iwin.addEventListener("scriptloader_load_bytecode", event => {

              count++;

              ok(true, "Script loaded from bytecode");

              if (count == 2) {

                resolve();

});

          iwin.addEventListener("scriptloader_bytecode_failed", () => {

            ok(false, "Bytecode encoding failed");

            SimpleTest.finish();

});

});

        let resultPromise = new Promise(resolve => {

          checkResult = resolve;

});

        iframe.src = "bug1656248_frame.html";

        let [_, result] = await Promise.all([eventPromise, resultPromise]);

        is(result, 42, `Module was loaded successfully (${i})`);

      SimpleTest.finish();

  </script>

</head>

<body onload="startTest()"></body>