browser_allocations_target.js

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/* Any copyright is dedicated to the Public Domain.

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

"use strict";

// Record allocations while spawning Commands and the first top level target

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 {

  CommandsFactory,

} = require("resource://devtools/shared/commands/commands-factory.js");

async function testScript(tab) {

  const commands = await CommandsFactory.forTab(tab);

  await commands.targetCommand.startListening();

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

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

  // destroy the commands to also destroy the dedicated client.

  await commands.destroy();

  // Spin the event loop to ensure commands destruction 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.

  await testScript(tab);

  await stopRecordingAllocations("target");

  gBrowser.removeTab(tab);

});