public function testGetFallbackDirs() {
$loader = new ClassLoader();
$loader
->addPrefix(null, __DIR__ . DIRECTORY_SEPARATOR . 'Fixtures');
$loader
->addPrefix(null, __DIR__ . DIRECTORY_SEPARATOR . 'Fixtures');
$fallback_dirs = $loader
->getFallbackDirs();
$this
->assertCount(2, $fallback_dirs);
}