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'; 23 24const common = require('../common'); 25const assert = require('assert'); 26const events = require('events'); 27 28// default 29{ 30 const e = new events.EventEmitter(); 31 32 for (let i = 0; i < 10; i++) { 33 e.on('default', common.mustNotCall()); 34 } 35 assert.ok(!e._events.default.hasOwnProperty('warned')); 36 e.on('default', common.mustNotCall()); 37 assert.ok(e._events.default.warned); 38 39 // symbol 40 const symbol = Symbol('symbol'); 41 e.setMaxListeners(1); 42 e.on(symbol, common.mustNotCall()); 43 assert.ok(!e._events[symbol].hasOwnProperty('warned')); 44 e.on(symbol, common.mustNotCall()); 45 assert.ok(e._events[symbol].hasOwnProperty('warned')); 46 47 // specific 48 e.setMaxListeners(5); 49 for (let i = 0; i < 5; i++) { 50 e.on('specific', common.mustNotCall()); 51 } 52 assert.ok(!e._events.specific.hasOwnProperty('warned')); 53 e.on('specific', common.mustNotCall()); 54 assert.ok(e._events.specific.warned); 55 56 // only one 57 e.setMaxListeners(1); 58 e.on('only one', common.mustNotCall()); 59 assert.ok(!e._events['only one'].hasOwnProperty('warned')); 60 e.on('only one', common.mustNotCall()); 61 assert.ok(e._events['only one'].hasOwnProperty('warned')); 62 63 // unlimited 64 e.setMaxListeners(0); 65 for (let i = 0; i < 1000; i++) { 66 e.on('unlimited', common.mustNotCall()); 67 } 68 assert.ok(!e._events.unlimited.hasOwnProperty('warned')); 69} 70 71// process-wide 72{ 73 events.EventEmitter.defaultMaxListeners = 42; 74 const e = new events.EventEmitter(); 75 76 for (let i = 0; i < 42; ++i) { 77 e.on('fortytwo', common.mustNotCall()); 78 } 79 assert.ok(!e._events.fortytwo.hasOwnProperty('warned')); 80 e.on('fortytwo', common.mustNotCall()); 81 assert.ok(e._events.fortytwo.hasOwnProperty('warned')); 82 delete e._events.fortytwo.warned; 83 84 events.EventEmitter.defaultMaxListeners = 44; 85 e.on('fortytwo', common.mustNotCall()); 86 assert.ok(!e._events.fortytwo.hasOwnProperty('warned')); 87 e.on('fortytwo', common.mustNotCall()); 88 assert.ok(e._events.fortytwo.hasOwnProperty('warned')); 89} 90 91// But _maxListeners still has precedence over defaultMaxListeners 92{ 93 events.EventEmitter.defaultMaxListeners = 42; 94 const e = new events.EventEmitter(); 95 e.setMaxListeners(1); 96 e.on('uno', common.mustNotCall()); 97 assert.ok(!e._events.uno.hasOwnProperty('warned')); 98 e.on('uno', common.mustNotCall()); 99 assert.ok(e._events.uno.hasOwnProperty('warned')); 100 101 // chainable 102 assert.strictEqual(e, e.setMaxListeners(1)); 103} 104