compute_pressure_timestamp_faster_collector.https.window.js

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /compute-pressure/compute_pressure_timestamp_faster_collector.https.window.html?globalScope=dedicated_worker - WPT Dashboard Interop Dashboard
- /compute-pressure/compute_pressure_timestamp_faster_collector.https.window.html?globalScope=window - WPT Dashboard Interop Dashboard

// META: timeout=long

// 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

// META: script=./resources/sync-pressure-observer.js

'use strict';

pressure_test(async (t) => {

  await create_virtual_pressure_source('cpu');

  t.add_cleanup(async () => {

    await remove_virtual_pressure_source('cpu');

});

  const sampleInterval = 250;

  const readings = ['nominal', 'fair', 'serious', 'critical'];

  const syncObserver = new SyncPressureObserver(t);

  await syncObserver.observer().observe('cpu', {sampleInterval});

  for (let i = 0; i < readings.length; ++i) {

    await update_virtual_pressure_source('cpu', readings[i]);

    await syncObserver.waitForUpdate();

  const pressureChanges = syncObserver.changes();

  assert_equals(pressureChanges.length, readings.length);

  assert_greater_than_equal(

      pressureChanges[1][0].time - pressureChanges[0][0].time, sampleInterval);

  assert_greater_than_equal(

      pressureChanges[2][0].time - pressureChanges[1][0].time, sampleInterval);

  assert_greater_than_equal(

      pressureChanges[3][0].time - pressureChanges[2][0].time, sampleInterval);

}, 'Faster collector: Timestamp difference between two changes should be higher or equal to the observer sample rate');

mark_as_done();