public function testNulledValuesAreSkipped()
{
$assetFilterManager = new AssetFilterManager(array('test/path.test' => array('null_filters' => null)));
$asset = new StringAsset('Herp Derp');
$assetFilterManager->setFilters('test/path.test', $asset);
$this->assertEquals('Herp Derp', $asset->dump());
}