javascript - No output from jasmine-node on FilesizeWatcherSpec - Newbie Alert -

i'm new node.js , jasmine, , javascript experience old , rusty, i'm newbie there too. finished manuel kiessling's book, the node beginner book, , working way through second book, the node craftsman book. i'm stuck on filesizewatcher tutorial. i've been able run earlier tests 1 not working. there similar question on so: no output jasmine-node answer isn't working me.

i'll post code here , can tell me i'm doing wrong.

filesizewatcherspec.js:

'use strict';  var filesizewatcher = require('./filesizewatcher'); var exec = require('child_process').exec;  describe('filesizewatcher', function() {     var watcher;      aftereach(function() {         watcher.stop();     });      it('should fire "grew" event when file grew in size', function(done) {          var path = './var/tmp/filesizewatcher.test';         exec('rm -f ' + path + ' ; touch ' + path, function() {             watcher = new filesizewatcher(path);              watcher.on('grew', function(gain) {                 expect(gain).tobe(5);                 done();             });              exec('echo "test" > ' + path, function(){});          });     });      it('should fire "shrank" event when file shrank in size', function(done) {          var path = './var/tmp/filesizewatcher.test';         exec('rm -f ' + path + ' ; echo "test" > ' + path, function() {             watcher = new filesizewather(path);              watcher.on('shrank', function(loss) {                 expect(loss).tobe(3);                 done();             });              exec('echo "a" > ' + path, function(){});          });     });      it('should fire "error" if path not start', function(done) {          var path = 'var/tmp/filesizewatcher.test';                 watcher = new filesizewather(path);           watcher.on('error', function(err) {             expect(err).tobe('path not start slash');             done();         });      });  }); 

filesizewatcher.js:

'use strict';  var fs = require('fs'); var util = require('util'); var eventemitter = require('events').eventemitter;  var filesizewatcher = function (path) {     var self = this;      if (/^\//.test(path) === false) {         process.nexttick(function() {             self.emit('error', 'path not start slash');         });         return;     }      fs.stat(path, function (err, stats) {         console.log('stats= ' + stats);         self.lastfilesize = stats.size;     });      self.interval = setinterval(                         function () {                 console.log('we in function()');                 fs.stat(path, function (err, stats) {                     if (stats.size > self.lastfilesize) {                         self.emit('grew', stats.size - self.lastfilesize);                         self.lastfilesize = stats.size;                     }                     if (stats.size < self.lastfilesize) {                         self.emit('shrank', self.lastfilesize - stats.size);                         self.lastfilesize = stats.size;                     }                 }, 1000);             }); };  util.inherits(filesizewatcher, eventemitter);  filesizewatcher.prototype.stop = function () {     clearinterval(this.interval); };  module.exports = filesizewatcher; 

console output:

c:\users\pdl\projects\nodecraftsman>jasmine-node ./filesizewatcherspec.js  c:\users\pdl\projects\nodecraftsman> 

other tests run fine:

c:\users\pdl\projects\nodecraftsmantestdrivendevelopment>jasmine-node spec\greetspec.js ..  finished in 0.006 seconds 2 tests, 2 assertions, 0 failures, 0 skipped   c:\users\pdl\projects\nodecraftsmantestdrivendevelopment> 

i added --captureexceptions see if information , got typeerror: self.callbacks.error not function.

my first problem eppilo suggested below, needed use process.nexttick on self.callbacks'error'. mixing async code sync code causes error event fired before error handler registered. made changes , using eventemitter i'm still getting following errors:

if include "." in path: var path = './var/tmp/filesizewatcher.test'; file gets written. otherwise, not.

if file not written, stats= undefined , receive error:

typeerror: cannot read property 'size' of undefined     @ c:\users\pdl\projects\nodecraftsman\filesizewatcher.js:19:34     @ fsreqwrap.oncomplete (fs.js:82:15) 

if file written, receive error:

error: uncaught, unspecified "error" event. (path not start slash)     @ emit (events.js:144:17)     @ c:\users\pdl\projects\nodecraftsman\filesizewatcher.js:12:18     @ nexttickcallbackwith0args (node.js:419:9)     @ process._tickcallback (node.js:348:13) 

of course, it's not supposed start slash. test. when remove --captureexceptions command, still no output.

first of try , run jasmine on verbose mode , capture exceptions:

jasmine-node ./filesizewatcherspec.js --verbose --captureexceptions 

link: https://github.com/mhevery/jasmine-node/wiki/command-line-usage

also try make error checking asynchronous:

if (/^\//.test(path) === false) {     process.nexttick(function() {         self.callbacks['error']('path not start slash');     });     return; }