File: test-event-emitter-memory-leak.js

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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// 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,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// Flags: --expose-gc

// Add and remove a lot of different events to an EventEmitter, then check
// that we didn't leak the event names.
var common = require('../common');
var assert = require('assert');
var events = require('events');

assert.equal(typeof gc, 'function', 'Run this test with --expose-gc');
gc();

var before = process.memoryUsage().heapUsed;
var e = new events.EventEmitter();

for (var i = 0; i < 2.5e5; ++i) {
  var name = 'a-pretty-long-event-name-' + i;
  e.on(name, assert.fail);
  e.removeListener(name, assert.fail);
}
gc();

var after = process.memoryUsage().heapUsed;
assert(after - before < 1024*1024, 'EventEmitter leaks event names.');