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/ answers: 1 / hits: 30947
/ 7 Years ago, fri, september 29, 2017, 12:00:00
ES6, Windows 10 x64, Node.js 8.6.0, Mocha 3.5.3
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;
}
}
}
Mocha test:
/* 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));
});
});
});
I launch the mocha directly through the PowerShell console. The result:
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