test_headless_content_process.js

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"use strict";

const TEST_REMOTE_TYPE = "test";

function allTestProcs() {

  return ChromeUtils.getAllDOMProcesses().filter(

    p => p.remoteType == TEST_REMOTE_TYPE

);

add_task(async function headlessContentProcessKeepAlive() {

  let testProcesses = allTestProcs();

  equal(testProcesses.length, 0);

  // Start the process, it should appear in the list.

  let keepAlive =

    await ChromeUtils.ensureHeadlessContentProcess(TEST_REMOTE_TYPE);

  let domProcess = keepAlive.domProcess;

  testProcesses = allTestProcs();

  equal(testProcesses.length, 1);

  equal(testProcesses[0], domProcess);

  ok(domProcess.canSend);

  // The process should be properly kept alive, so `releaseCachedProcesses()`

  // should not shut it down.

  Services.ppmm.releaseCachedProcesses();

  testProcesses = allTestProcs();

  equal(testProcesses.length, 1);

  equal(testProcesses[0], domProcess);

  ok(domProcess.canSend);

  // Invalidating the keep alive should lead to the process being shut down.

  keepAlive.invalidateKeepAlive();

  // Wait for the process to be shut down.

  await new Promise(resolve => {

    Services.obs.addObserver(function obs(subject, topic) {

      equal(topic, "ipc:content-shutdown");

      if (

        subject.QueryInterface(Ci.nsIPropertyBag2).getProperty("childID") ==

        domProcess.childID

) {

        Services.obs.removeObserver(obs, "ipc:content-shutdown");

        resolve();

    }, "ipc:content-shutdown");

});

  testProcesses = allTestProcs();

  equal(testProcesses.length, 0);

  ok(!domProcess.canSend);

});