browser_perf-04.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/. */

"use strict";

/**

 * Run through a series of basic recording actions for the perf actor.

*/

add_task(async function () {

  const { front, client } = await initPerfFront();

  // Assert the initial state.

is(

    await front.isSupportedPlatform(),

    true,

    "This test only runs on supported platforms."

);

  is(await front.isActive(), false, "The profiler is not active yet.");

  // Getting the active Browser ID to assert in the "profiler-started" event.

  const win = Services.wm.getMostRecentWindow("navigator:browser");

  const activeTabID = win.gBrowser.selectedBrowser.browsingContext.browserId;

  front.once(

    "profiler-started",

    (entries, interval, features, duration, activeTID) => {

      is(entries, 1024, "Should apply entries by startProfiler");

      is(interval, 0.1, "Should apply interval by startProfiler");

      is(typeof features, "number", "Should apply features by startProfiler");

      is(duration, 2, "Should apply duration by startProfiler");

is(

        activeTID,

        activeTabID,

        "Should apply active browser ID by startProfiler"

);

);

  // Start the profiler.

  await front.startProfiler({

    entries: 1000,

    duration: 2,

    interval: 0.1,

    features: ["js", "stackwalk"],

});

  is(await front.isActive(), true, "The profiler is active.");

  // clean up

  await front.stopProfilerAndDiscardProfile();

  await front.destroy();

  await client.close();

});