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a912b791d4
Adds tests for the case in which listeners() is invoked on a EventEmitter with no events. Adds a new test case for the situation in which a class inherits from the EventEmitter but overrides the constructor in the EventEmitter so that the _events is never set. PR-URL: https://github.com/nodejs/node/pull/9865 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Myles Borins <myles.borins@gmail.com>
66 lines
1.7 KiB
JavaScript
66 lines
1.7 KiB
JavaScript
'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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const util = require('util');
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function listener() {}
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function listener2() {}
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class TestStream { constructor() { } }
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util.inherits(TestStream, events.EventEmitter);
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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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const s = new TestStream();
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assert.deepStrictEqual(s.listeners('foo'), []);
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}
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