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96 lines
3.1 KiB
96 lines
3.1 KiB
// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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'use strict';
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const common = require('../common');
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const assert = require('assert');
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const EventEmitter = require('events');
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{
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const ee = new EventEmitter();
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const events_new_listener_emitted = [];
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const listeners_new_listener_emitted = [];
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// Sanity check
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assert.strictEqual(ee.addListener, ee.on);
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ee.on('newListener', function(event, listener) {
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// Don't track newListener listeners.
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if (event === 'newListener')
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return;
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events_new_listener_emitted.push(event);
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listeners_new_listener_emitted.push(listener);
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});
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const hello = common.mustCall(function(a, b) {
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assert.strictEqual('a', a);
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assert.strictEqual('b', b);
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});
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ee.once('newListener', function(name, listener) {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(listener, hello);
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assert.deepStrictEqual(this.listeners('hello'), []);
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});
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ee.on('hello', hello);
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ee.once('foo', assert.fail);
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assert.deepStrictEqual(['hello', 'foo'], events_new_listener_emitted);
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assert.deepStrictEqual([hello, assert.fail], listeners_new_listener_emitted);
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ee.emit('hello', 'a', 'b');
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}
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// just make sure that this doesn't throw:
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{
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const f = new EventEmitter();
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f.setMaxListeners(0);
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}
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{
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const listen1 = () => {};
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const listen2 = () => {};
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const ee = new EventEmitter();
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ee.once('newListener', function() {
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assert.deepStrictEqual(ee.listeners('hello'), []);
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ee.once('newListener', function() {
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assert.deepStrictEqual(ee.listeners('hello'), []);
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});
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ee.on('hello', listen2);
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});
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ee.on('hello', listen1);
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// The order of listeners on an event is not always the order in which the
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// listeners were added.
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assert.deepStrictEqual(ee.listeners('hello'), [listen2, listen1]);
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}
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// Verify that the listener must be a function
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common.expectsError(() => {
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const ee = new EventEmitter();
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ee.on('foo', null);
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}, {
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code: 'ERR_INVALID_ARG_TYPE',
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type: TypeError,
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message: 'The "listener" argument must be of type function'
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});
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