core-js/tests/unit-global/web.set-timeout.js

import { timeLimitedPromise } from '../helpers/helpers.js';

QUnit.test('setTimeout / clearTimeout', assert => {
  assert.isFunction(setTimeout, 'setTimeout is function');
  assert.isFunction(clearTimeout, 'clearTimeout is function');
  assert.name(setTimeout, 'setTimeout');
  assert.name(clearTimeout, 'clearTimeout');

  return timeLimitedPromise(1e3, resolve => {
    setTimeout((a, b) => { resolve(a + b); }, 10, 'a', 'b');
  }).then(it => {
    assert.same(it, 'ab', 'setTimeout works with additional args');
  }, () => {
    assert.avoid('setTimeout works with additional args');
  }).then(() => {
    return timeLimitedPromise(50, resolve => {
      clearTimeout(setTimeout(resolve, 10));
    });
  }).then(() => {
    assert.avoid('clearTimeout works with wrapped setTimeout');
  }, () => {
    assert.required('clearTimeout works with wrapped setTimeout');
  });
});