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events: port some wpt tests
PR-URL: #33621
Reviewed-By: James M Snell <jasnell@gmail.com>
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benjamingr authored and BethGriggs committed Dec 15, 2020
1 parent de3c804 commit 570a8bf
Showing 1 changed file with 91 additions and 0 deletions.
91 changes: 91 additions & 0 deletions test/parallel/test-eventtarget-whatwg-once.js
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// Flags: --expose-internals --no-warnings
'use strict';

const common = require('../common');

const {
Event,
EventTarget,
} = require('internal/event_target');

const {
strictEqual,
} = require('assert');

// Manually ported from: wpt@dom/events/AddEventListenerOptions-once.html
{
const document = new EventTarget();
let invoked_once = false;
let invoked_normal = false;
function handler_once() {
invoked_once = true;
}

function handler_normal() {
invoked_normal = true;
}

document.addEventListener('test', handler_once, { once: true });
document.addEventListener('test', handler_normal);
document.dispatchEvent(new Event('test'));
strictEqual(invoked_once, true, 'Once handler should be invoked');
strictEqual(invoked_normal, true, 'Normal handler should be invoked');

invoked_once = false;
invoked_normal = false;
document.dispatchEvent(new Event('test'));
strictEqual(invoked_once, false, 'Once handler shouldn\'t be invoked again');
strictEqual(invoked_normal, true, 'Normal handler should be invoked again');
document.removeEventListener('test', handler_normal);
}


{
// Manually ported from AddEventListenerOptions-once.html
const document = new EventTarget();
let invoked_count = 0;
function handler() {
invoked_count++;
}
document.addEventListener('test', handler, { once: true });
document.addEventListener('test', handler);
document.dispatchEvent(new Event('test'));
strictEqual(invoked_count, 1, 'The handler should only be added once');

invoked_count = 0;
document.dispatchEvent(new Event('test'));
strictEqual(invoked_count, 0, 'The handler was added as a once listener');

invoked_count = 0;
document.addEventListener('test', handler, { once: true });
document.removeEventListener('test', handler);
document.dispatchEvent(new Event('test'));
strictEqual(invoked_count, 0, 'The handler should have been removed');
}

{
// TODO(benjamingr) fix EventTarget recursion
common.skip('EventTarget recursion is currently broken');
const document = new EventTarget();
let invoked_count = 0;
function handler() {
invoked_count++;
if (invoked_count === 1)
document.dispatchEvent(new Event('test'));
}
document.addEventListener('test', handler, { once: true });
document.dispatchEvent(new Event('test'));
strictEqual(invoked_count, 1, 'Once handler should only be invoked once');

invoked_count = 0;
function handler2() {
invoked_count++;
if (invoked_count === 1)
document.addEventListener('test', handler2, { once: true });
if (invoked_count <= 2)
document.dispatchEvent(new Event('test'));
}
document.addEventListener('test', handler2, { once: true });
document.dispatchEvent(new Event('test'));
strictEqual(invoked_count, 2, 'Once handler should only be invoked once');
}

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