compute_pressure_take_records.https.window.js

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /compute-pressure/compute_pressure_take_records.https.window.html?globalScope=dedicated_worker - WPT Dashboard Interop Dashboard
- /compute-pressure/compute_pressure_take_records.https.window.html?globalScope=window - WPT Dashboard Interop Dashboard

// META: variant=?globalScope=window

// META: variant=?globalScope=dedicated_worker

// META: script=/resources/testdriver.js

// META: script=/resources/testdriver-vendor.js

// META: script=/common/utils.js

// META: script=/common/dispatcher/dispatcher.js

// META: script=./resources/common.js

'use strict';

pressure_test(async (t) => {

  const observer = new PressureObserver(

      t.unreached_func('This callback should not have been called.'));

  const records = observer.takeRecords();

  assert_equals(records.length, 0, 'No record before observe');

}, 'Calling takeRecords() before observe()');

pressure_test(async (t) => {

  await create_virtual_pressure_source('cpu');

  t.add_cleanup(async () => {

    await remove_virtual_pressure_source('cpu');

});

  let observer;

  const changes = await new Promise((resolve, reject) => {

    observer = new PressureObserver(resolve);

    t.add_cleanup(() => observer.disconnect());

    observer.observe('cpu').catch(reject);

    update_virtual_pressure_source('cpu', 'critical').catch(reject);

});

  assert_equals(changes[0].state, 'critical');

  const records = observer.takeRecords();

  assert_equals(records.length, 0, 'No record available');

}, 'takeRecords() returns empty record after callback invoke');

mark_as_done();