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Edit File: max-listeners.js

// 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.

var common = require('./common');
var assert = require('assert');
var events = require('../');
var e = new events.EventEmitter();

var hasDefineProperty = !!Object.defineProperty;
try { Object.defineProperty({}, 'x', { value: 0 }); } catch (err) { hasDefineProperty = false }

e.on('maxListeners', common.mustCall());

// Should not corrupt the 'maxListeners' queue.
e.setMaxListeners(42);

var throwsObjs = [NaN, -1, 'and even this'];
var maxError = /^RangeError: The value of "n" is out of range\. It must be a non-negative number\./;
var defError = /^RangeError: The value of "defaultMaxListeners" is out of range\. It must be a non-negative number\./;

for (var i = 0; i < throwsObjs.length; i++) {
  var obj = throwsObjs[i];
  assert.throws(function() { e.setMaxListeners(obj); }, maxError);
  if (hasDefineProperty) {
    assert.throws(function() { events.defaultMaxListeners = obj; }, defError);
  }
}

e.emit('maxListeners');

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