Added tests for id3v2, added sample data.

lib/id3/index.js

@@ -84,10 +84,12 @@ ID3File.prototype.getTags = function getTags(version) {
 var ID3v2_ALIAS = exports.ID3v2_ALIAS = {
   "title"  : ["TIT2", "TT2"],
   "artist" : ["TPE1", "TP1"],
+  "albumartist" : ["TPE2", "TP2"],
   "album"  : ["TALB", "TAL"],
   "year"   : ["TYER", "TYE"],
   "comment": ["COMM", "COM"],
   "track"  : ["TRCK", "TRK"],
+  "disk"   : ["TPOS",  "TPA"],
   "genre"  : ["TCON", "TCO"],
   "picture": ["APIC", "PIC"],
   "lyrics" : ["USLT", "ULT"]

test/test-id3v2.js

@@ -0,0 +1,18 @@
+var assert = require('assert'),
+    id3 = require('../lib/id3'),
+    fs  = require('fs');
+
+var audioFile = fs.readFileSync('sample3v2.mp3');
+var id3v2 = new id3(audioFile);
+
+id3v2.parse();
+
+assert.equal(id3v2.get('title'),'Home', 'title is not correct');
+assert.equal(id3v2.get('artist'), 'Explosions In The Sky', 'artist is not correct');
+assert.equal(id3v2.get('albumartist'), 'Soundtrack', 'album artist is not correct');
+assert.equal(id3v2.get('album'), 'Friday Night Lights [Original Movie Soundtrack]', 'album is not correct');
+assert.equal(id3v2.get('year'), 2004, 'year is not correct');
+assert.equal(id3v2.get('track'),'5','track is not correct');
+assert.equal(id3v2.get('disk'),'1/1', 'disk is not correct');
+assert.equal(id3v2.get('genre'),'Soundtrack', 'genre is not correct');
+assert.equal(id3v2.get('picture').data.length, 80938, 'picture length is not correct');