public function testDeleteDirectory()
{
mkdir(__DIR__ . '/foo');
file_put_contents(__DIR__ . '/foo/file.txt', 'Hello World');
$files = new Filesystem();
$files->deleteDirectory(__DIR__ . '/foo');
$this->assertFalse(is_dir(__DIR__ . '/foo'));
$this->assertFileNotExists(__DIR__ . '/foo/file.txt');
}
