browser_parent_worker_nested.js

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// Verify that a parent-process (chrome) worker and the nested worker it spawns

// both register through the parent-process RemoteWorkerDebugger (bug 1944240),

// and that the nested worker's debugger URL is resolved to an absolute URL.

"use strict";

const BASE = "chrome://mochitests/content/browser/dom/workers/test/";

const CHROME_WORKER_URL = BASE + "nested_chrome_worker.js";

const NESTED_WORKER_URL = BASE + "nested_worker.js";

add_task(async function test_nested_parent_worker_is_remote() {

  await SpecialPowers.pushPrefEnv({

    set: [["dom.worker.remoteDebugger.enabled", true]],

});

  const wdm = Cc["@mozilla.org/dom/workers/workerdebuggermanager;1"].getService(

    Ci.nsIWorkerDebuggerManager

);

  info("Create a top-level chrome worker that spawns a nested worker");

  const chromeWorker = new ChromeWorker(CHROME_WORKER_URL);

  info("Wait for the nested worker to load");

  await new Promise(resolve => {

    chromeWorker.onmessage = e => {

      if (e.data === "nested:nested worker loaded") {

        resolve();

};

});

  ok(true, "Nested parent worker loaded without deadlock or crash.");

  const debuggers = Array.from(wdm.getWorkerDebuggerEnumerator());

  const parentDbg = debuggers.find(d => d.url === CHROME_WORKER_URL);

  const nestedDbg = debuggers.find(d => d.url.endsWith("nested_worker.js"));

  ok(parentDbg, "Top-level chrome worker registered its debugger.");

  ok(nestedDbg, "Nested parent worker registered its debugger.");

is(

    parentDbg?.isRemote,

    true,

    "Top-level chrome worker uses the RemoteWorkerDebugger."

);

is(

    nestedDbg?.isRemote,

    true,

    "Nested parent worker uses the RemoteWorkerDebugger."

);

  // The nested worker registers off the main thread, so its URL is resolved

  // against the parent's resolved script URI; it must end up absolute.

  is(nestedDbg?.url, NESTED_WORKER_URL, "Nested worker URL is absolute.");

  chromeWorker.terminate();

});