compute_pressure_timestamp.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_timestamp.https.any.html - WPT Dashboard Interop Dashboard
- /compute-pressure/compute_pressure_timestamp.https.any.sharedworker.html - WPT Dashboard Interop Dashboard
- /compute-pressure/compute_pressure_timestamp.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 readings = ['nominal', 'fair', 'serious', 'critical'];

  const sampleInterval = 250;

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

    const observerChanges = [];

    const observer = new PressureObserver(changes => {

      observerChanges.push(changes);

});

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

    mockPressureService.startPlatformCollector(sampleInterval / 2);

    let i = 0;

    // mockPressureService.updatesDelivered() does not necessarily match

    // pressureChanges.length, as system load and browser optimizations can

    // cause the actual timer used by mockPressureService to deliver readings

    // to be a bit slower or faster than requested.

    while (observerChanges.length < 4) {

      mockPressureService.setPressureUpdate(

          'cpu', readings[i++ % readings.length]);

      await t.step_wait(

          () => mockPressureService.updatesDelivered() >= i,

          `At least ${i} readings have been delivered`);

    observer.disconnect();

    resolve(observerChanges);

});

  assert_equals(pressureChanges.length, 4);

  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');

pressure_test(async (t, mockPressureService) => {

  const pressureChanges = [];

  const sampleInterval = 1000;

  const observer = new PressureObserver(changes => {

    pressureChanges.push(changes);

});

  await new Promise(async resolve => {

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

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

    mockPressureService.startPlatformCollector(sampleInterval);

    await t.step_wait(() => pressureChanges.length == 1);

    observer.disconnect();

    resolve();

});

  await new Promise(async resolve => {

    observer.observe('cpu');

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

    mockPressureService.startPlatformCollector(sampleInterval / 4);

    await t.step_wait(() => pressureChanges.length == 2);

    observer.disconnect();

    resolve();

});

  assert_equals(pressureChanges.length, 2);

  // When disconnect() is called, PressureRecord in [[LastRecordMap]] for cpu

  // should be deleted. So the second PressureRecord is not discarded even

  // though the time interval does not meet the requirement.

  assert_less_than(

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

}, 'disconnect() should update [[LastRecordMap]]');