@After
 public void tearDown() {
   server.stop();
 }
 @Test
 public void testWorksWithEphemeralPort() throws IOException {
   int assignedPort = server.getLocalPort();
   Socket socket = new Socket("127.0.0.1", assignedPort);
   assertTrue(socket.isConnected());
 }
 @Before
 public void setUp() {
   server = new StubServer(0);
   server.start();
 }