chromium/src/third_party/blink/web_tests/external/wpt/idle-detection/resources/idle-detection-disabled-by-feature-policy-worker.js

'use strict';

importScripts('/resources/testharness.js');

const header = 'Feature-Policy header {"idle-detection" : []}';
let workerType;

if (typeof postMessage === 'function') {
  workerType = 'dedicated';
}

promise_test(async () => {
  try {
    await new IdleDetector().start();
    assert_unreached('expected start() to throw with SecurityError');
  } catch (error) {
    assert_equals(error.name, 'SecurityError');
  }
},
`Inherited ${header} disallows ${workerType} workers.`);

done();