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124 lines
3.4 KiB
124 lines
3.4 KiB
'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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function listener1() {}
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function listener2() {}
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{
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const ee = new EventEmitter();
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ee.on('hello', listener1);
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ee.on('removeListener', common.mustCall((name, cb) => {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(cb, listener1);
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}));
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ee.removeListener('hello', listener1);
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assert.deepStrictEqual([], ee.listeners('hello'));
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}
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{
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const ee = new EventEmitter();
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ee.on('hello', listener1);
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ee.on('removeListener', common.fail);
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ee.removeListener('hello', listener2);
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assert.deepStrictEqual([listener1], ee.listeners('hello'));
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}
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{
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const ee = new EventEmitter();
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ee.on('hello', listener1);
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ee.on('hello', listener2);
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ee.once('removeListener', common.mustCall((name, cb) => {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(cb, listener1);
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assert.deepStrictEqual([listener2], ee.listeners('hello'));
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}));
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ee.removeListener('hello', listener1);
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assert.deepStrictEqual([listener2], ee.listeners('hello'));
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ee.once('removeListener', common.mustCall((name, cb) => {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(cb, listener2);
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assert.deepStrictEqual([], ee.listeners('hello'));
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}));
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ee.removeListener('hello', listener2);
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assert.deepStrictEqual([], ee.listeners('hello'));
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}
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{
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const ee = new EventEmitter();
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function remove1() {
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common.fail('remove1 should not have been called');
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}
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function remove2() {
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common.fail('remove2 should not have been called');
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}
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ee.on('removeListener', common.mustCall(function(name, cb) {
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if (cb !== remove1) return;
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this.removeListener('quux', remove2);
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this.emit('quux');
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}, 2));
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ee.on('quux', remove1);
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ee.on('quux', remove2);
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ee.removeListener('quux', remove1);
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}
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{
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const ee = new EventEmitter();
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ee.on('hello', listener1);
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ee.on('hello', listener2);
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ee.once('removeListener', common.mustCall((name, cb) => {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(cb, listener1);
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assert.deepStrictEqual([listener2], ee.listeners('hello'));
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ee.once('removeListener', common.mustCall((name, cb) => {
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assert.strictEqual(name, 'hello');
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assert.strictEqual(cb, listener2);
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assert.deepStrictEqual([], ee.listeners('hello'));
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}));
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ee.removeListener('hello', listener2);
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assert.deepStrictEqual([], ee.listeners('hello'));
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}));
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ee.removeListener('hello', listener1);
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assert.deepStrictEqual([], ee.listeners('hello'));
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}
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{
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const ee = new EventEmitter();
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const listener3 = common.mustCall(() => {
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ee.removeListener('hello', listener4);
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}, 2);
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const listener4 = common.mustCall(() => {});
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ee.on('hello', listener3);
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ee.on('hello', listener4);
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// listener4 will still be called although it is removed by listener 3.
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ee.emit('hello');
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// This is so because the interal listener array at time of emit
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// was [listener3,listener4]
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// Interal listener array [listener3]
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ee.emit('hello');
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}
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{
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const ee = new EventEmitter();
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ee.once('hello', listener1);
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ee.on('removeListener', common.mustCall((eventName, listener) => {
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assert.strictEqual(eventName, 'hello');
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assert.strictEqual(listener, listener1);
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}));
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ee.emit('hello');
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}
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// Verify that the removed listener must be a function
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assert.throws(() => {
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const ee = new EventEmitter();
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ee.removeListener('foo', null);
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}, /^TypeError: "listener" argument must be a function$/);
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