public function testSetCreatesDir() {
$dir = sys_get_temp_dir() . '/assetic/fscachetest';
$tearDown = function () use ($dir) {
array_map('unlink', glob($dir . '/*'));
@rmdir($dir);
};
$tearDown();
$cache = new FilesystemCache($dir);
$cache
->set('foo', 'bar');
$this
->assertFileExists($dir . '/foo');
$tearDown();
}