mocha in your serial

mocha-serial.js

var assert = require('assert');
var SerialPort = require('serialport').SerialPort;
var device = require('./config.json')['device'];

describe('opening and closing a serial port', function() {
    var serialport;

    this.timeout(10000);

    before(function() {
        serialport = new SerialPort(device);
    });

    it('should open', function(done) {
        serialport.on('open', function() {
            done();
        });
    });

    it('should close', function(done) {
        serialport.on('close', function() {
            done();
        });
        serialport.close();
    });

    it('should reopen', function(done) {
        serialport.on('open', function() {
            done();
        });
        serialport.open();
    });

    it('should close again', function(done) {
        serialport.on('close', function() {
            done();
        });
        serialport.close();
    });

});