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// 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');
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