@theia/core/src/common/event.spec.ts

Theia is a cloud & desktop IDE framework implemented in TypeScript.

// *****************************************************************************
// Copyright (C) 2018 Ericsson and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0.
//
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License v. 2.0 are satisfied: GNU General Public License, version 2
// with the GNU Classpath Exception which is available at
// https://www.gnu.org/software/classpath/license.html.
//
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
// *****************************************************************************

import { expect } from 'chai';
import { Emitter } from './event';

describe('Event Objects', () => {

    it('Emitter firing should be synchronous', () => {
        const emitter = new Emitter<undefined>();
        let counter = 0;

        emitter.event(() => counter++);
        expect(counter).eq(0);
        emitter.fire(undefined);
        expect(counter).eq(1);
    });

});