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'use strict';
promise_test(async t => {
const observer1_changes = [];
const observer1 = new PressureObserver(changes => {
observer1_changes.push(changes);
}, {sampleRate: 1});
t.add_cleanup(() => observer1.disconnect());
// Ensure that observer1's schema gets registered before observer2 starts.
const promise = observer1.observe('cpu');
observer1.disconnect();
observer1.disconnect();
await promise_rejects_dom(t, 'NotSupportedError', promise);
const observer2_changes = [];
await new Promise((resolve, reject) => {
const observer2 = new PressureObserver(changes => {
observer2_changes.push(changes);
resolve();
}, {sampleRate: 1});
t.add_cleanup(() => observer2.disconnect());
observer2.observe('cpu').catch(reject);
});
assert_equals(
observer1_changes.length, 0,
'stopped observers should not receive callbacks');
assert_equals(observer2_changes.length, 1);
assert_in_array(
observer2_changes[0][0].state, ['nominal', 'fair', 'serious', 'critical'],
'cpu pressure state');
}, 'Stopped PressureObserver do not receive changes');
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