| // 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 EventEmitter = require('../'); |
| |
| { |
| var ee = new EventEmitter(); |
| var events_new_listener_emitted = []; |
| var listeners_new_listener_emitted = []; |
| |
| // Sanity check |
| assert.strictEqual(ee.addListener, ee.on); |
| |
| ee.on('newListener', function(event, listener) { |
| // Don't track newListener listeners. |
| if (event === 'newListener') |
| return; |
| |
| events_new_listener_emitted.push(event); |
| listeners_new_listener_emitted.push(listener); |
| }); |
| |
| var hello = common.mustCall(function(a, b) { |
| assert.strictEqual('a', a); |
| assert.strictEqual('b', b); |
| }); |
| |
| ee.once('newListener', function(name, listener) { |
| assert.strictEqual(name, 'hello'); |
| assert.strictEqual(listener, hello); |
| |
| var listeners = this.listeners('hello'); |
| assert.ok(Array.isArray(listeners)); |
| assert.strictEqual(listeners.length, 0); |
| }); |
| |
| ee.on('hello', hello); |
| ee.once('foo', assert.fail); |
| |
| assert.ok(Array.isArray(events_new_listener_emitted)); |
| assert.strictEqual(events_new_listener_emitted.length, 2); |
| assert.strictEqual(events_new_listener_emitted[0], 'hello'); |
| assert.strictEqual(events_new_listener_emitted[1], 'foo'); |
| |
| assert.ok(Array.isArray(listeners_new_listener_emitted)); |
| assert.strictEqual(listeners_new_listener_emitted.length, 2); |
| assert.strictEqual(listeners_new_listener_emitted[0], hello); |
| assert.strictEqual(listeners_new_listener_emitted[1], assert.fail); |
| |
| ee.emit('hello', 'a', 'b'); |
| } |
| |
| // just make sure that this doesn't throw: |
| { |
| var f = new EventEmitter(); |
| |
| f.setMaxListeners(0); |
| } |
| |
| { |
| var listen1 = function() {}; |
| var listen2 = function() {}; |
| var ee = new EventEmitter(); |
| |
| ee.once('newListener', function() { |
| var listeners = ee.listeners('hello'); |
| assert.ok(Array.isArray(listeners)); |
| assert.strictEqual(listeners.length, 0); |
| ee.once('newListener', function() { |
| var listeners = ee.listeners('hello'); |
| assert.ok(Array.isArray(listeners)); |
| assert.strictEqual(listeners.length, 0); |
| }); |
| ee.on('hello', listen2); |
| }); |
| ee.on('hello', listen1); |
| // The order of listeners on an event is not always the order in which the |
| // listeners were added. |
| var listeners = ee.listeners('hello'); |
| assert.ok(Array.isArray(listeners)); |
| assert.strictEqual(listeners.length, 2); |
| assert.strictEqual(listeners[0], listen2); |
| assert.strictEqual(listeners[1], listen1); |
| } |
| |
| // Verify that the listener must be a function |
| assert.throws(function() { |
| var ee = new EventEmitter(); |
| |
| ee.on('foo', null); |
| }, /^TypeError: The "listener" argument must be of type Function. Received type object$/); |