JUnit как написать тест

public class Firgure {
    private int R;
 
    public Firgure() {
        R = 10;
    }
 
    public Firgure(int r) {
        R = r;
    }
 
    @Override
    public String toString() {
        return "Firgure{" +
                "R=" + R +
                '}';
    }
 
    public int getR() {
        return R;
    }
 
    public void setR(int r) {
        R = r;
    }
 
    public boolean Hit(Point p) {
        if (p.x < R && p.x > -R && p.y > -R && p.y < R) return true;
        return false;
    }
}

public class FirgureTest{
 
    public static final int EXPECTED = 10;
 
    @Test
    public void testHit() throws Exception {
        Firgure firgure = new Firgure(EXPECTED);
        Assert.assertEquals(EXPECTED, firgure.getR());
    }
}

public class Server extends Thread {
    private static final int PORT = 8080;
    private static ServerSocket serverSocket;
    private Socket client;
    private ObjectInputStream objectInputStream;
    private ObjectOutputStream objectOutputStream;
    private BufferedReader bufferedReader;
    private Firgure firgure;
    private ArrayList<Point> points;
    private boolean[] hitAnswer;
 
 
    public Server(Socket client) {
        System.out.println("Client connected");
        this.client = client;
        firgure = new Firgure();
        setDaemon(true);
        setPriority(NORM_PRIORITY);
        start();
    }
 
    static public void Main(String[] args) throws IOException {
        System.out.println("Server startes");
        serverSocket = new ServerSocket(PORT);
        System.out.println("Wait client");
        new Server(serverSocket.accept());
    }
 
    @Override
    public void run() {
        System.out.println("Create streams");
        try {
            objectInputStream = new ObjectInputStream(client.getInputStream());
            objectOutputStream = new ObjectOutputStream(client.getOutputStream());
            bufferedReader = new BufferedReader(new InputStreamReader(client.getInputStream()));
            String inputLine;
 
            while ((inputLine = bufferedReader.readLine()) != null) {
                if (inputLine.equalsIgnoreCase("hit")) getPoints();
                else close();
            }
        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        } catch (ClassNotFoundException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        } finally {
            close();
        }
    }
 
    public int getR() {
        return firgure.getR();
    }
 
    public void setR(int R) {
        firgure.setR(R);
    }
 
    public void getPoints() throws IOException, ClassNotFoundException {
        objectOutputStream.writeBoolean(true);
        points = (ArrayList<Point>) objectInputStream.readObject();
        hitAnswer = new boolean[points.size()];
        int i = 0;
        for (Point p : points)
            hitAnswer[i++] = firgure.Hit(p);
        objectOutputStream.writeObject(hitAnswer);
    }
 
    private void close() {
        try {
            if (objectInputStream != null) objectInputStream.close();
            if (objectOutputStream != null) objectOutputStream.close();
            if (bufferedReader != null) bufferedReader.close();
            if (client != null) client.close();
        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }
 
    }
}

public class ServerTest {
 
    public static final String host = "localhost";
    public static final int PORT = 8888;
    public static Socket server;
 
    @Before
    public void setUp() throws Exception {
        Thread t = new Thread() {
            public void run() {
                try {
                    Server.serverStart();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        };
        t.start();
        server = new Socket(host, PORT);
    }
 
    @Test
    public void test() throws Exception {
        ArrayList<Point> poins = new ArrayList<Point>();
        poins.add(new Point(0, 0));
    }
}