可以在Mocha测试中使用ES6模块吗? [英] Is it possible to use ES6 modules in Mocha tests?

问题描述

ES6，Windows 10 x64，Node.js 8.6.0，Mocha 3.5.3

ES6, Windows 10 x64, Node.js 8.6.0, Mocha 3.5.3

是否可以在Mocha测试中使用ES6模块?我遇到了export和import关键字的问题.

Is it possible to use ES6 modules in Mocha tests? I have the problems with export and import keywords.

/* eventEmitter.js
 */

/* Event emitter. */
export default class EventEmitter{

    constructor(){

        const subscriptions = new Map();

        Object.defineProperty(this, 'subscriptions', {
            enumerable: false,
            configurable: false,
            get: function(){
                return subscriptions;
            }
        });
    }

    /* Add the event listener.
     * @eventName - the event name. 
     * @listener - the listener.
     */
    addListener(eventName, listener){
        if(!eventName || !listener) return false;
        else{
            if(this.subscriptions.has(eventName)){
                const arr = this.subscriptions.get(eventName);
                arr.push(listener);
            }
            else{
                const arr = [listener];
                this.subscriptions.set(eventName, arr);
            }
            return true;
        }
    }

    /* Delete the event listener.
     * @eventName - the event name. 
     * @listener - the listener.
     */
    deleteListener(eventName, listener){
        if(!eventName || !listener) return false;
        else{
            if(this.subscriptions.has(eventName)){
                const arr = this.subscriptions.get(eventName);
                let index = arr.indexOf(listener);

                if(index >= 0){
                    arr.splice(index, 1);
                    return true;
                }
                else{
                    return false;
                }
            }
            else{
                return false;
            }
        }
    }

    /* Emit the event.
     * @eventName - the event name. 
     * @info - the event argument.
     */
    emit(eventName, info){
        if(!eventName || !this.subscriptions.has(eventName)) {
            return false;
        }
        else{
            for(let fn of this.subscriptions.get(eventName)){
                if(fn) fn(info);
            }
            return true;
        }
    }
}

摩卡测试:

/* test.js 
 * Mocha tests.
 */
import EventEmitter from '../../src/js/eventEmitter.js';

const assert = require('assert');

describe('EventEmitter', function() {
  describe('#constructor()', function() {
    it('should work.', function() {
        const em = new EventEmitter();
        assert.equal(true, Boolean(em));
    });
  });
});

我直接通过PowerShell控制台启动mocha.结果:

I launch the mocha directly through the PowerShell console. The result:

推荐答案

Babel和Browserfy都有可能 https://drublic.de/blog/es6-modules-using-browserify -mocha/

It's possible with Babel and Browserfy https://drublic.de/blog/es6-modules-using-browserify-mocha/

这篇关于可以在Mocha测试中使用ES6模块吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！