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// 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);
}, {sampleInterval});
observer.observe('cpu');
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);
}, {sampleInterval});
await new Promise(async resolve => {
observer.observe('cpu');
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]]');
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