compute_pressure_duplicate_updates.https.any.js

Enable keyboard shortcuts

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_duplicate_updates.https.any.html - WPT Dashboard Interop Dashboard
- /compute-pressure/compute_pressure_duplicate_updates.https.any.sharedworker.html - WPT Dashboard Interop Dashboard
- /compute-pressure/compute_pressure_duplicate_updates.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';

pressure_test(async (t, mockPressureService) => {

  const pressureChanges = await new Promise(async resolve => {

    const observer_changes = [];

    let n = 0;

    const observer = new PressureObserver(changes => {

      observer_changes.push(changes);

      if (++n === 2)

        resolve(observer_changes);

});

    observer.observe('cpu', {sampleInterval: 200});

    const updatesDelivered = mockPressureService.updatesDelivered();

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

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

    // Deliver 2 updates.

    await t.step_wait(

        () => mockPressureService.updatesDelivered() >= (updatesDelivered + 2),

        'Wait for more than one update to be delivered to the observer');

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

    // Deliver more updates, |resolve()| will be called when the new pressure

    // state reaches PressureObserver and its callback is invoked

    // for the second time.

});

  assert_equals(pressureChanges.length, 2);

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

  assert_equals(pressureChanges[1][0].state, 'nominal');

}, 'Changes that fail the "has change in data" test are discarded.');