public function testRestoreAuth()
 {
     $io = new IO\NullIO();
     $io->setAuthentication('example.com', 'user', 'pass');
     $req = new HttpGetRequest('example.com', 'http://example.com/foo.txt', $io);
     self::assertSame('user', $req->username);
     self::assertSame('pass', $req->password);
 }