browser_perf-01.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";

// This test is at the edge of timing out, probably because of LUL

// initialization on Linux. This is also happening only once, which is why only

// this test needs it: for other tests LUL is already initialized because

// they're running in the same Firefox instance.

// See also bug 1635442.

requestLongerTimeout(2);

/**

 * 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.");

  // Start the profiler.

  const profilerStarted = once(front, "profiler-started");

  await front.startProfiler();

  await profilerStarted;

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

  // Stop the profiler and assert the results.

  const profilerStopped1 = once(front, "profiler-stopped");

  const profile = await front.getProfileAndStopProfiler();

  await profilerStopped1;

  is(await front.isActive(), false, "The profiler was stopped.");

  ok("threads" in profile, "The actor was used to record a profile.");

  // Restart the profiler.

  await front.startProfiler();

  is(await front.isActive(), true, "The profiler was re-started.");

  // Stop and discard.

  const profilerStopped2 = once(front, "profiler-stopped");

  await front.stopProfilerAndDiscardProfile();

  await profilerStopped2;

is(

    await front.isActive(),

    false,

    "The profiler was stopped and the profile discarded."

);

  // Clean up.

  await front.destroy();

  await client.close();

});