compute_pressure_take_records.https.any.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.any.html - WPT Dashboard Interop Dashboard
- /compute-pressure/compute_pressure_take_records.https.any.sharedworker.html - WPT Dashboard Interop Dashboard
- /compute-pressure/compute_pressure_take_records.https.any.worker.html - WPT Dashboard Interop Dashboard

// META: script=/resources/test-only-api.js

// META: script=resources/pressure-helpers.js

// META: global=window,dedicatedworker,sharedworker

'use strict';

test(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, mockPressureService) => {

  let observer;

  const changes = await new Promise(resolve => {

    observer = new PressureObserver(resolve);

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

    observer.observe('cpu');

    mockPressureService.setPressureUpdate('cpu', 'critical');

    mockPressureService.startPlatformCollector(/*sampleInterval=*/ 200);

});

  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');