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79 lines
2.5 KiB
79 lines
2.5 KiB
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const events = require('events');
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function expect(expected) {
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const actual = [];
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process.on('exit', function() {
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assert.deepStrictEqual(actual.sort(), expected.sort());
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});
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function listener(name) {
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actual.push(name);
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}
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return common.mustCall(listener, expected.length);
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}
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function listener() {}
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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.on('bar', listener);
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ee.on('baz', listener);
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ee.on('baz', listener);
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const fooListeners = ee.listeners('foo');
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const barListeners = ee.listeners('bar');
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const bazListeners = ee.listeners('baz');
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ee.on('removeListener', expect(['bar', 'baz', 'baz']));
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ee.removeAllListeners('bar');
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ee.removeAllListeners('baz');
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assert.deepStrictEqual(ee.listeners('foo'), [listener]);
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assert.deepStrictEqual(ee.listeners('bar'), []);
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assert.deepStrictEqual(ee.listeners('baz'), []);
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// After calling removeAllListeners(),
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// the old listeners array should stay unchanged.
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assert.deepStrictEqual(fooListeners, [listener]);
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assert.deepStrictEqual(barListeners, [listener]);
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assert.deepStrictEqual(bazListeners, [listener, listener]);
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// After calling removeAllListeners(),
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// new listeners arrays is different from the old.
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assert.notEqual(ee.listeners('bar'), barListeners);
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assert.notEqual(ee.listeners('baz'), bazListeners);
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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.on('bar', listener);
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// Expect LIFO order
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ee.on('removeListener', expect(['foo', 'bar', 'removeListener']));
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ee.on('removeListener', expect(['foo', 'bar']));
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ee.removeAllListeners();
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assert.deepStrictEqual([], ee.listeners('foo'));
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assert.deepStrictEqual([], ee.listeners('bar'));
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}
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{
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const ee = new events.EventEmitter();
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ee.on('removeListener', listener);
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// Check for regression where removeAllListeners() throws when
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// there exists a 'removeListener' listener, but there exists
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// no listeners for the provided event type.
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assert.doesNotThrow(ee.removeAllListeners.bind(ee, 'foo'));
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}
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{
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const ee = new events.EventEmitter();
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var expectLength = 2;
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ee.on('removeListener', function(name, listener) {
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assert.strictEqual(expectLength--, this.listeners('baz').length);
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});
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ee.on('baz', function() {});
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ee.on('baz', function() {});
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ee.on('baz', function() {});
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assert.strictEqual(ee.listeners('baz').length, expectLength + 1);
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ee.removeAllListeners('baz');
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assert.strictEqual(ee.listeners('baz').length, 0);
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}
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