browser_ConsoleListener_cached_messages.js

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/* 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/. */

const TEST_PAGE =

  "https://example.com/document-builder.sjs?html=<meta charset=utf8></meta>";

add_task(async function test_cached_javascript_errors() {

  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, TEST_PAGE);

  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);

  await createScriptNode(`(() => {throw "error1"})()`);

  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {

    const innerWindowId = content.windowGlobalChild.innerWindowId;

    const { ConsoleListener } = ChromeUtils.importESModule(

      "chrome://remote/content/shared/listeners/ConsoleListener.sys.mjs"

);

    const listener = new ConsoleListener(innerWindowId);

    const errors = [];

    // Do not push the whole error object in the array. It would create a strong

    // reference preventing from reproducing GC-related bugs.

    const onError = (evtName, error) => errors.push(error.message);

    listener.on("error", onError);

    const waitForMessage = listener.once("error");

    listener.startListening();

    const error = await waitForMessage;

    is(error.message, "uncaught exception: error1");

    is(errors.length, 1);

    listener.stopListening();

    content.backup = { listener, errors, onError };

});

  // Force a GC to check that old cached messages which have been garbage

  // collected are not re-displayed.

  await doGC();

  await createScriptNode(`(() => {throw "error2"})()`);

  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {

    const { listener, errors, onError } = content.backup;

    const waitForMessage = listener.once("error");

    listener.startListening();

    const { message } = await waitForMessage;

    is(message, "uncaught exception: error2");

    is(errors.length, 2);

    listener.off("error", onError);

    listener.destroy();

});

  info("Reload the current tab and check only new messages are emitted");

  await BrowserTestUtils.reloadTab(gBrowser.selectedTab);

  await createScriptNode(`(() => {throw "error3"})()`);

  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {

    const innerWindowId = content.windowGlobalChild.innerWindowId;

    const { ConsoleListener } = ChromeUtils.importESModule(

      "chrome://remote/content/shared/listeners/ConsoleListener.sys.mjs"

);

    const listener = new ConsoleListener(innerWindowId);

    const errors = [];

    const onError = (evtName, error) => errors.push(error.message);

    listener.on("error", onError);

    const waitForMessage = listener.once("error");

    listener.startListening();

    const error = await waitForMessage;

    is(error.message, "uncaught exception: error3");

    is(errors.length, 1);

    listener.off("error", onError);

    listener.destroy();

});

  gBrowser.removeTab(gBrowser.selectedTab);

});