gecko-dev/dom/workers/test/browser_consoleSharedWorkers.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

add_task(async function test() {
  const testURL = getRootDirectory(gTestPath) + "empty.html";
  let tab = BrowserTestUtils.addTab(gBrowser, testURL);
  gBrowser.selectedTab = tab;

  await BrowserTestUtils.browserLoaded(gBrowser.getBrowserForTab(tab));

  let promise = new Promise(resolve => {
    function consoleListener() {
      Services.obs.addObserver(this, "console-api-log-event");
      Services.obs.addObserver(this, "console-api-profiler");
    }

    var order = 0;
    consoleListener.prototype = {
      observe: (aSubject, aTopic, aData) => {
        ok(true, "Something has been received");

        if (aTopic == "console-api-profiler") {
          var obj = aSubject.wrappedJSObject;
          is(
            obj.arguments[0],
            "Hello profiling from a SharedWorker!",
            "A message from a SharedWorker \\o/"
          );
          is(order++, 0, "First a profiler message.");

          Services.obs.removeObserver(cl, "console-api-profiler");
          return;
        }

        if (aTopic == "console-api-log-event") {
          var obj = aSubject.wrappedJSObject;
          is(
            obj.arguments[0],
            "Hello world from a SharedWorker!",
            "A message from a SharedWorker \\o/"
          );
          is(
            obj.ID,
            "chrome://mochitests/content/browser/dom/workers/test/sharedWorker_console.js",
            "The ID is SharedWorker"
          );
          is(obj.innerID, "SharedWorker", "The ID is SharedWorker");
          is(order++, 1, "Then a log message.");

          Services.obs.removeObserver(cl, "console-api-log-event");
          resolve();
          return;
        }
      },
    };

    var cl = new consoleListener();
  });

  await ContentTask.spawn(tab.linkedBrowser, {}, async function() {
    new content.SharedWorker("sharedWorker_console.js");
  });

  await promise;

  await BrowserTestUtils.removeTab(tab);
});