mirror of https://gitee.com/openkylin/nodejs.git
125 lines
4.0 KiB
JavaScript
125 lines
4.0 KiB
JavaScript
// 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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require('../common');
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const assert = require('assert');
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const events = require('events');
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function listener() {}
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function listener2() {}
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function listener3() {
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return 0;
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}
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function listener4() {
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return 1;
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}
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{
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const ee = new events.EventEmitter();
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ee.on('foo', listener);
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const fooListeners = ee.listeners('foo');
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assert.deepStrictEqual(ee.listeners('foo'), [listener]);
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ee.removeAllListeners('foo');
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assert.deepStrictEqual(ee.listeners('foo'), []);
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assert.deepStrictEqual(fooListeners, [listener]);
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}
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{
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const ee = new events.EventEmitter();
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ee.on('foo', listener);
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const eeListenersCopy = ee.listeners('foo');
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assert.deepStrictEqual(eeListenersCopy, [listener]);
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assert.deepStrictEqual(ee.listeners('foo'), [listener]);
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eeListenersCopy.push(listener2);
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assert.deepStrictEqual(ee.listeners('foo'), [listener]);
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assert.deepStrictEqual(eeListenersCopy, [listener, listener2]);
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}
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{
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const ee = new events.EventEmitter();
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ee.on('foo', listener);
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const eeListenersCopy = ee.listeners('foo');
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ee.on('foo', listener2);
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assert.deepStrictEqual(ee.listeners('foo'), [listener, listener2]);
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assert.deepStrictEqual(eeListenersCopy, [listener]);
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}
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{
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const ee = new events.EventEmitter();
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ee.once('foo', listener);
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assert.deepStrictEqual(ee.listeners('foo'), [listener]);
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}
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{
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const ee = new events.EventEmitter();
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ee.on('foo', listener);
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ee.once('foo', listener2);
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assert.deepStrictEqual(ee.listeners('foo'), [listener, listener2]);
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}
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{
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const ee = new events.EventEmitter();
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ee._events = undefined;
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assert.deepStrictEqual(ee.listeners('foo'), []);
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}
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{
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class TestStream extends events.EventEmitter {}
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const s = new TestStream();
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assert.deepStrictEqual(s.listeners('foo'), []);
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}
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{
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const ee = new events.EventEmitter();
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ee.on('foo', listener);
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const wrappedListener = ee.rawListeners('foo');
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assert.strictEqual(wrappedListener.length, 1);
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assert.strictEqual(wrappedListener[0], listener);
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assert.notStrictEqual(wrappedListener, ee.rawListeners('foo'));
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ee.once('foo', listener);
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const wrappedListeners = ee.rawListeners('foo');
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assert.strictEqual(wrappedListeners.length, 2);
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assert.strictEqual(wrappedListeners[0], listener);
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assert.notStrictEqual(wrappedListeners[1], listener);
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assert.strictEqual(wrappedListeners[1].listener, listener);
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assert.notStrictEqual(wrappedListeners, ee.rawListeners('foo'));
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ee.emit('foo');
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assert.strictEqual(wrappedListeners.length, 2);
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assert.strictEqual(wrappedListeners[1].listener, listener);
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}
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{
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const ee = new events.EventEmitter();
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ee.once('foo', listener3);
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ee.on('foo', listener4);
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const rawListeners = ee.rawListeners('foo');
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assert.strictEqual(rawListeners.length, 2);
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assert.strictEqual(rawListeners[0](), 0);
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const rawListener = ee.rawListeners('foo');
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assert.strictEqual(rawListener.length, 1);
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assert.strictEqual(rawListener[0](), 1);
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}
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