public function testRewrite($collectionArray = [], $rewriteArray = [], $expect = null)
{
/* setup */
$optionArray = ['directory' => Stream::url('root/cache/styles'), 'extension' => 'css', 'attribute' => 'href', 'lifetime' => 86400];
$loader = new Assetic\Loader(Registry::getInstance());
$loader->init($collectionArray, 'css')->concat($optionArray, $rewriteArray)->concat($optionArray, $rewriteArray);
/* actual */
$file = $loader->getCollectionArray()['bundle']['href'];
$actual = file_get_contents($file);
/* compare */
$this->assertEquals($expect, $actual);
}