browser_perf-02.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";

/**

 * Test what happens when other tools control the profiler.

*/

add_task(async function () {

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

  // Simulate other tools by getting an independent handle on the Gecko Profiler.

  // eslint-disable-next-line mozilla/use-services

  const geckoProfiler = Cc["@mozilla.org/tools/profiler;1"].getService(

    Ci.nsIProfiler

);

  is(await front.isActive(), false, "The profiler hasn't been started yet.");

  // Start the profiler.

  await front.startProfiler();

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

  // Stop the profiler manually through the Gecko Profiler interface.

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

  geckoProfiler.StopProfiler();

  await profilerStopped;

is(

    await front.isActive(),

    false,

    "The profiler was stopped by another tool."

);

  // Clean up.

  await front.destroy();

  await client.close();

});