node/test/simple/test-event-emitter-subclass.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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var common = require('../common');
var assert = require('assert');
var EventEmitter = require('events').EventEmitter;
var util = require('util');

util.inherits(MyEE, EventEmitter);

function MyEE(cb) {
  this.once(1, cb);
  this.emit(1);
  this.removeAllListeners();
  EventEmitter.call(this);
}

var called = false;
var myee = new MyEE(function() {
  called = true;
});


util.inherits(ErrorEE, EventEmitter);
function ErrorEE() {
  this.emit('error', new Error('blerg'));
}

assert.throws(function() {
  new ErrorEE();
}, /blerg/);

process.on('exit', function() {
  assert(called);
  assert.deepEqual(myee._events, {});
  console.log('ok');
});


function MyEE2() {
  EventEmitter.call(this);
}

MyEE2.prototype = new EventEmitter();

var ee1 = new MyEE2();
var ee2 = new MyEE2();

ee1.on('x', function () {});

assert.equal(EventEmitter.listenerCount(ee2, 'x'), 0);