1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22'use strict'; 23require('../common'); 24const assert = require('assert'); 25const events = require('events'); 26 27let callbacks_called = []; 28 29const e = new events.EventEmitter(); 30 31function callback1() { 32 callbacks_called.push('callback1'); 33 e.on('foo', callback2); 34 e.on('foo', callback3); 35 e.removeListener('foo', callback1); 36} 37 38function callback2() { 39 callbacks_called.push('callback2'); 40 e.removeListener('foo', callback2); 41} 42 43function callback3() { 44 callbacks_called.push('callback3'); 45 e.removeListener('foo', callback3); 46} 47 48e.on('foo', callback1); 49assert.strictEqual(e.listeners('foo').length, 1); 50 51e.emit('foo'); 52assert.strictEqual(e.listeners('foo').length, 2); 53assert.deepStrictEqual(['callback1'], callbacks_called); 54 55e.emit('foo'); 56assert.strictEqual(e.listeners('foo').length, 0); 57assert.deepStrictEqual(['callback1', 'callback2', 'callback3'], 58 callbacks_called); 59 60e.emit('foo'); 61assert.strictEqual(e.listeners('foo').length, 0); 62assert.deepStrictEqual(['callback1', 'callback2', 'callback3'], 63 callbacks_called); 64 65e.on('foo', callback1); 66e.on('foo', callback2); 67assert.strictEqual(e.listeners('foo').length, 2); 68e.removeAllListeners('foo'); 69assert.strictEqual(e.listeners('foo').length, 0); 70 71// Verify that removing callbacks while in emit allows emits to propagate to 72// all listeners 73callbacks_called = []; 74 75e.on('foo', callback2); 76e.on('foo', callback3); 77assert.strictEqual(e.listeners('foo').length, 2); 78e.emit('foo'); 79assert.deepStrictEqual(['callback2', 'callback3'], callbacks_called); 80assert.strictEqual(e.listeners('foo').length, 0); 81