node/test/parallel/test-event-emitter-special-event-names.js

'use strict';

const common = require('../common');
const EventEmitter = require('events');
const assert = require('assert');

const ee = new EventEmitter();
const handler = common.noop;

assert.deepStrictEqual(ee.eventNames(), []);

assert.strictEqual(ee._events.hasOwnProperty, undefined);
assert.strictEqual(ee._events.toString, undefined);

ee.on('__proto__', handler);
ee.on('__defineGetter__', handler);
ee.on('toString', handler);

assert.deepStrictEqual(ee.eventNames(), [
  '__proto__',
  '__defineGetter__',
  'toString'
]);

assert.deepStrictEqual(ee.listeners('__proto__'), [handler]);
assert.deepStrictEqual(ee.listeners('__defineGetter__'), [handler]);
assert.deepStrictEqual(ee.listeners('toString'), [handler]);

ee.on('__proto__', common.mustCall(function(val) {
  assert.strictEqual(val, 1);
}));
ee.emit('__proto__', 1);

process.on('__proto__', common.mustCall(function(val) {
  assert.strictEqual(val, 1);
}));
process.emit('__proto__', 1);