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'use strict';
promise_test(async t => {
const changes1_promise = new Promise((resolve, reject) => {
const observer = new PressureObserver(resolve, {sampleRate: 1.0});
t.add_cleanup(() => observer.disconnect());
observer.observe('cpu').catch(reject);
});
// iframe numbers are aligned with observer numbers. The first observer is
// in the main frame, so there is no iframe1.
const iframe2 = document.createElement('iframe');
document.body.appendChild(iframe2);
const changes2_promise = new Promise((resolve, reject) => {
const observer =
new iframe2.contentWindow.PressureObserver(resolve, {sampleRate: 1.0});
t.add_cleanup(() => observer.disconnect());
observer.observe('cpu').catch(reject);
});
const iframe3 = document.createElement('iframe');
document.body.appendChild(iframe3);
const changes3_promise = new Promise((resolve, reject) => {
const observer =
new iframe3.contentWindow.PressureObserver(resolve, {sampleRate: 1.0});
t.add_cleanup(() => observer.disconnect());
observer.observe('cpu').catch(reject);
});
const [changes1, changes2, changes3] =
await Promise.all([changes1_promise, changes2_promise, changes3_promise]);
for (const changes of [changes1, changes2, changes3]) {
assert_in_array(
changes[0].state, ['nominal', 'fair', 'serious', 'critical'],
'cpu pressure state');
}
}, 'Three PressureObserver instances, in different iframes, receive changes');
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