mirror of
https://github.com/microsoft/playwright.git
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85 lines
2.7 KiB
TypeScript
85 lines
2.7 KiB
TypeScript
// Copyright Joyent, Inc. and other Node contributors.
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// Modifications copyright (c) by Microsoft Corporation
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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import { test, expect } from '@playwright/test';
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import { EventEmitter } from '../../../packages/playwright-core/lib/client/eventEmitter';
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import * as common from './utils';
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test('should work', () => {
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const e = new EventEmitter();
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e.once('hello', common.mustCall());
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e.emit('hello', 'a', 'b');
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e.emit('hello', 'a', 'b');
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e.emit('hello', 'a', 'b');
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e.emit('hello', 'a', 'b');
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const remove = () => {
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expect(false).toBe(true);
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};
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e.once('foo', remove);
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e.removeListener('foo', remove);
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e.emit('foo');
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e.once('e', common.mustCall(() => {
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e.emit('e');
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}));
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e.once('e', common.mustCall());
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e.emit('e');
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// Verify that the listener must be a function
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expect(() => {
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const ee = new EventEmitter();
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ee.once('foo', null);
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}).toThrow(TypeError);
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});
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test('once() has different code paths based on the number of arguments being emitted', () => {
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// Verify that all of the cases are covered.
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const maxArgs = 4;
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for (let i = 0; i <= maxArgs; i++) {
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const ee = new EventEmitter();
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const args: any[] = ['foo'];
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for (let j = 0; j < i; j++)
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args.push(j);
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ee.once('foo', common.mustCall((...params) => {
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const restArgs = args.slice(1);
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expect(Array.isArray(params)).toBeTruthy();
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expect(params).toHaveLength(restArgs.length);
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for (let index = 0; index < params.length; index++) {
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const param = params[index];
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expect(param).toEqual(restArgs[index]);
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}
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}));
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EventEmitter.prototype.emit.apply(ee, args);
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}
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});
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