| // 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 update = await new Promise((resolve, reject) => { |
| const observer = new PressureObserver(resolve); |
| t.add_cleanup(() => observer.disconnect()); |
| observer.observe('cpu').catch(reject); |
| observer.observe('cpu').catch(reject); |
| observer.observe('cpu').catch(reject); |
| mockPressureService.setPressureUpdate('cpu', 'critical'); |
| mockPressureService.startPlatformCollector(/*sampleRate=*/ 5.0); |
| }); |
| |
| assert_equals(update[0].state, 'critical'); |
| }, 'PressureObserver.observe() is idempotent'); |