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59 lines
1.6 KiB
59 lines
1.6 KiB
'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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let callbacks_called = [];
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const e = new events.EventEmitter();
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function callback1() {
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callbacks_called.push('callback1');
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e.on('foo', callback2);
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e.on('foo', callback3);
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e.removeListener('foo', callback1);
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}
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function callback2() {
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callbacks_called.push('callback2');
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e.removeListener('foo', callback2);
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}
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function callback3() {
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callbacks_called.push('callback3');
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e.removeListener('foo', callback3);
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}
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e.on('foo', callback1);
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assert.strictEqual(e.listeners('foo').length, 1);
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e.emit('foo');
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assert.strictEqual(e.listeners('foo').length, 2);
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assert.deepStrictEqual(['callback1'], callbacks_called);
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e.emit('foo');
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assert.strictEqual(e.listeners('foo').length, 0);
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assert.deepStrictEqual(['callback1', 'callback2', 'callback3'],
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callbacks_called);
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e.emit('foo');
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assert.strictEqual(e.listeners('foo').length, 0);
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assert.deepStrictEqual(['callback1', 'callback2', 'callback3'],
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callbacks_called);
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e.on('foo', callback1);
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e.on('foo', callback2);
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assert.strictEqual(e.listeners('foo').length, 2);
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e.removeAllListeners('foo');
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assert.strictEqual(e.listeners('foo').length, 0);
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// Verify that removing callbacks while in emit allows emits to propagate to
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// all listeners
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callbacks_called = [];
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e.on('foo', callback2);
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e.on('foo', callback3);
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assert.strictEqual(2, e.listeners('foo').length);
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e.emit('foo');
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assert.deepStrictEqual(['callback2', 'callback3'], callbacks_called);
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assert.strictEqual(0, e.listeners('foo').length);
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