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34 changes: 22 additions & 12 deletions test/parallel/test-eventtarget-once-twice.js
Original file line number Diff line number Diff line change
@@ -1,14 +1,24 @@
'use strict';
const common = require('../common');
const { once } = require('events');

const et = new EventTarget();
(async function() {
await once(et, 'foo');
await once(et, 'foo');
})().then(common.mustCall());

et.dispatchEvent(new Event('foo'));
setImmediate(() => {
et.dispatchEvent(new Event('foo'));
require('../common');
const { once } = require('node:events');
const { test } = require('node:test');
const { setImmediate } = require('node:timers/promises');

test('should resolve `once` twice', async () => {

const et = new EventTarget();

await Promise.all([
(async () => {
await once(et, 'foo');
await once(et, 'foo');
})(),

(async () => {
et.dispatchEvent(new Event('foo'));
await setImmediate();
et.dispatchEvent(new Event('foo'));
})(),
]);

});
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