fix existsSync

test/download.js

@@ -1,9 +1,11 @@
-var vows = require('vows')
- , ytdl = require('..')
- , fs = require('fs')
- , path = require('path')
- , assert = require('assert')
- , video = 'http://www.youtube.com/watch?v=90AiXO1pAiA'
+var vows = require('vows')
+ , ytdl = require('..')
+ , fs = require('fs')
+ , path = require('path')
+ , existsSync = fs.existsSync || path.existsSync
+ , assert = require('assert')
+ , video = 'http://www.youtube.com/watch?v=90AiXO1pAiA'
+ ;
 
 
 vows.describe('download').addBatch({
@@ -36,7 +38,7 @@ vows.describe('download').addBatch({
  'file was downloaded': function(err, data) {
  // check existance
  var filepath = path.join(__dirname, data.filename);
- assert.isTrue(fs.existsSync(filepath));
+ assert.isTrue(existsSync(filepath));
 
  // delete file after each test
  fs.unlinkSync(filepath);