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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 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.');
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