gecko-dev/toolkit/components/antitracking/test/browser/browser_storageAccessPrivateWindow.js

/* import-globals-from antitracking_head.js */

AntiTracking.runTest("Storage Access API called in a private window",
  // blocking callback
  async _ => {
    /* import-globals-from storageAccessAPIHelpers.js */
    let [threw, rejected] = await callRequestStorageAccess();
    ok(!threw, "requestStorageAccess should not throw");
    ok(rejected, "requestStorageAccess shouldn't be available");
  },

  null, // non-blocking callback
  // cleanup function
  async _ => {
    await new Promise(resolve => {
      Services.clearData.deleteData(Ci.nsIClearDataService.CLEAR_ALL, value => resolve());
    });
  },
  [["dom.storage_access.enabled", true]], // extra prefs
  false, // no window open test
  false, // no user-interaction test
  0, // no blocking notifications
  true, // run in private window
  null // iframe sandbox
);