Composer is not loading my own psr-0 files

I can't seem to get composer to work with my own classes/files using the psr-0 autoload mechanism. Can anyone please shed some light as to why the below isn't working? I'm getting the following output in my error log: PHP Fatal error: Class 'TestdirTest1' not found in /home/webroot/bitlama/index.php on line 5 It does work If I uncomment the explicit require statement (index.php:2). And if anybody is wondering - yes I have run composer install in the form of: 'php ../composer.phar install'. This is my directory structure: ``` ├── composer.json ├── index.php ├── testspacedir │   └── Testdir │   └── test1.php └── vendor ├── autoload.php └── composer ├── autoload_classmap.php ├── autoload_namespaces.php ├── autoload_real.php └── ClassLoader.php ``` composer.json: ``` { "autoload": { "psr-0": { "Testdir\\": "testspacedir/"} } } ``` test1.php: ``` <?php namespace Testdir; class Test1 { public function __construct() { echo "Woohoo Test1"; } } ``` index.php: ``` <?php require 'vendor/autoload.php'; //require 'testspacedir/Testdir/test1.php'; $test1 = new Testdir\Test1(); ``` vendor/autoload.php: ``` <?php // autoload.php @generated by Composer require_once __DIR__ . '/composer' . '/autoload_real.php'; return ComposerAutoloaderInit7b4760e0f7ca9d6454dd2f098c374ba4::getLoader(); ```