测试代码中的window.dispatchEvent不会触发window.addEventListener。开发者社区

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window.addEventListener('message', (event) => {
    if (event.data.type === 'abc') {
      console.log(event.data.payload);
});

expect(jest.fn()).toHaveBeenCalledTimes(expected)
Expected number of calls: 1
Received number of calls: 0
  102 |     window.dispatchEvent(messageEvent);
  103 |
> 104 |     expect(listenerSpy).toHaveBeenCalledTimes(1);
      |                         ^

setTimeout(() => {
  fireAnEvent("message", this, MessageEvent, { data: message });
}, 0);

export function main() {
  window.addEventListener('message', (event) => {
    if (event.data.type === 'abc') {
      console.log(event.data.payload);
}

import { main } from './';
function flushMessageQueue(ms = 10) {
  return new Promise((resolve) => setTimeout(resolve, ms));
describe('71912032', () => {
  test('should pass', async () => {
    const logSpy = jest.spyOn(console, 'log');
    main();
    const data = { type: 'abc', payload: 'xyz' };
    window.postMessage(data, '*');
    await flushMessageQueue();
    expect(logSpy).toBeCalledWith('xyz');
});

 PASS  stackoverflow/71912032/index.test.ts
  71912032
    ✓ should pass (41 ms)
  console.log

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问 测试代码中的window.dispatchEvent不会触发window.addEventListener。 EN

回答 2

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