browser_allocations_toolbox.js

Enable keyboard shortcuts

/* Any copyright is dedicated to the Public Domain.

   http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

// Record allocations while opening and closing DevTools

const TEST_URL =

  "data:text/html;charset=UTF-8,<div>Target allocations test</div>";

const { require } = ChromeUtils.importESModule(

  "resource://devtools/shared/loader/Loader.sys.mjs"

);

const {

  gDevTools,

} = require("resource://devtools/client/framework/devtools.js");

async function testScript(tab) {

  const toolbox = await gDevTools.showToolboxForTab(tab, {

    toolId: "inspector",

});

  // eslint-disable-next-line mozilla/no-arbitrary-setTimeout

  await new Promise(resolve => setTimeout(resolve, 1000));

  await toolbox.destroy();

  // Spin the event loop to ensure toolbox destroy is fully completed

  // eslint-disable-next-line mozilla/no-arbitrary-setTimeout

  await new Promise(resolve => setTimeout(resolve, 0));

add_task(async function () {

  const tab = await addTab(TEST_URL);

  // Run the test scenario first before recording in order to load all the

  // modules. Otherwise they get reported as "still allocated" objects,

  // whereas we do expect them to be kept in memory as they are loaded via

  // the main DevTools loader, which keeps the module loaded until the

  // shutdown of Firefox

  await testScript(tab);

  await startRecordingAllocations();

  // Now, run the test script. This time, we record this run.

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

    await testScript(tab);

  await stopRecordingAllocations("toolbox");

  gBrowser.removeTab(tab);

});