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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 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$/);
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