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1ab5b4ef20
This commit splits several large event emitter tests into smaller block scoped tests. This keeps the tests more isolated. This commit also replaces var with const, assert.equal() with assert.stictEqual(), and other small enhancements. PR-URL: https://github.com/nodejs/node/pull/6446 Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
80 lines
2.5 KiB
JavaScript
80 lines
2.5 KiB
JavaScript
'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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