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rOACCT/node_modules/events/tests/check-listener-leaks.js
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check-listener-leaks.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.

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

			// Redirect warning output to tape.
			var consoleWarn = console.warn;
			console.warn = common.test.comment;

			common.test.on('end', function () {
			console.warn = consoleWarn;
			});

			// default
			{
			var e = new events.EventEmitter();

			for (var i = 0; i < 10; i++) {
			e.on('default', common.mustNotCall());
			}
			assert.ok(!e._events['default'].hasOwnProperty('warned'));
			e.on('default', common.mustNotCall());
			assert.ok(e._events['default'].warned);

			// specific
			e.setMaxListeners(5);
			for (var i = 0; i < 5; i++) {
			e.on('specific', common.mustNotCall());
			}
			assert.ok(!e._events['specific'].hasOwnProperty('warned'));
			e.on('specific', common.mustNotCall());
			assert.ok(e._events['specific'].warned);

			// only one
			e.setMaxListeners(1);
			e.on('only one', common.mustNotCall());
			assert.ok(!e._events['only one'].hasOwnProperty('warned'));
			e.on('only one', common.mustNotCall());
			assert.ok(e._events['only one'].hasOwnProperty('warned'));

			// unlimited
			e.setMaxListeners(0);
			for (var i = 0; i < 1000; i++) {
			e.on('unlimited', common.mustNotCall());
			}
			assert.ok(!e._events['unlimited'].hasOwnProperty('warned'));
			}

			// process-wide
			{
			events.EventEmitter.defaultMaxListeners = 42;
			var e = new events.EventEmitter();

			for (var i = 0; i < 42; ++i) {
			e.on('fortytwo', common.mustNotCall());
			}
			assert.ok(!e._events['fortytwo'].hasOwnProperty('warned'));
			e.on('fortytwo', common.mustNotCall());
			assert.ok(e._events['fortytwo'].hasOwnProperty('warned'));
			delete e._events['fortytwo'].warned;

			events.EventEmitter.defaultMaxListeners = 44;
			e.on('fortytwo', common.mustNotCall());
			assert.ok(!e._events['fortytwo'].hasOwnProperty('warned'));
			e.on('fortytwo', common.mustNotCall());
			assert.ok(e._events['fortytwo'].hasOwnProperty('warned'));
			}

			// but _maxListeners still has precedence over defaultMaxListeners
			{
			events.EventEmitter.defaultMaxListeners = 42;
			var e = new events.EventEmitter();
			e.setMaxListeners(1);
			e.on('uno', common.mustNotCall());
			assert.ok(!e._events['uno'].hasOwnProperty('warned'));
			e.on('uno', common.mustNotCall());
			assert.ok(e._events['uno'].hasOwnProperty('warned'));

			// chainable
			assert.strictEqual(e, e.setMaxListeners(1));
			}