public function testGetConfigFiles()
 {
     $loader = new FilesLoader('config directory path not in use in this case');
     $expected = ['test' => 'vfs://root/test.php', 'foo' => 'vfs://root/foo.php', 'bar' => 'vfs://root/bar.php'];
     $this->assertSame($expected, $loader->getConfigFiles(vfsStream::url('root')));
 }