javascript - Rookie error while writing test with Chai, Mocha, Express, johnny-five and node -

hi there i'm trying learn bit of test driven development using express, mocha, chai , johnny-five. wrote little application can turn led on , off. application works test fails. can tell me doing wrong in test?
thank you

the output of npm test is

> blink@1.0.0 test /users/me/documents/johnny-five/blink > mocha --reporter spec 1435257445439 looking connected device   j5     .on()       1) should turn led on     .off()       ✓ should turn led off   1 passing (13ms)   1 failing   1) j5 .on() should turn led on:      assertionerror: expected undefined equal 1       @ context.<anonymous> (test/j5.js:9:14) npm err! test failed.  see above more details. 

this test/j5.js

require('mocha'); var assert =  require('chai').assert; var j5 = require("../j5");  describe('j5', function () {   describe('.on()', function () {     it('should turn led on',function(){       var result = j5.on();       assert.equal(result, 1);     });   });    describe('.off()', function () {     it('should turn led off', function () {       // var res = j5.on();       // expect(res).to.equal(0);     });   }); }); 

this server.js

var express = require("express"); var app = express(); var j5 = require("./j5"); var port = 3000; app.get('/', function(req, res){   res.send('hello j5'); }); app.get("/on", function(req, res) {   j5.on();   res.send("on"); }); app.get("/off", function(req, res) {   j5.off();   res.send("off"); }); console.log("listening on port http://localhost:" + port); app.listen(3000); 

this j5.js

var exports = module.exports = {}; var 5 = require("johnny-five"); var board = new five.board(); var board_ready = false; var led = null; board.on("ready", function() {   board_ready = true;   led = new five.led(13); }); exports.on = function() {   if (led !== null && board_ready === true) {     led.on();     return 1;   } }; exports.off = function() {   if (led !== null && board_ready === true) {     led.off();     return 0;   } }; 

edit: path j5.js in test/j5.js wrong. have new error. assertionerror: expected undefined equal 1 @ context. (test/j5.js:9:14).

after playing around found error.
johnny-five needs time connect board via serial. build in repl available can use functions on() , off(). made test wait 5 seconds before making call of j5.on(). standard max timeout done() function 2000ms. make longer used this.timeout(10000);

this new test/j5.js

require('mocha'); var assert = require('chai').assert; var j5 = require("../j5"); var result = null; describe('j5', function() {   describe('.on()', function() {     it('should turn led on', function(done) {       this.timeout(10000);       settimeout(function() {         result = j5.on();         assert.equal(result, 1);         done();       }, 5000);     });   }); }); 

result of npm test:

> blink@1.0.0 test /users/icke/documents/johnny-five/blink > mocha --reporter spec 1435305595110 device(s) /dev/cu.usbmodem1421 1435305595124 connected /dev/cu.usbmodem1421   j5     .on() 1435305598694 repl initialized       ✓ should turn led on (5003ms)     .off()       ✓ should turn led off     2 passing (5s)