Unit test with HTTP server

ServiceTest.java

package org.example.service;

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.core.io.ClassPathResource;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Random;
import java.util.Scanner;
import java.util.stream.Collectors;

import static org.junit.Assert.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

public class ServiceTest {

    Server server;

    public class TestServlet extends HttpServlet {

        protected void doPost(
                HttpServletRequest request,
                HttpServletResponse response)
                throws ServletException, IOException {

            int status = HttpServletResponse.SC_SERVICE_UNAVAILABLE;
            String output = "";
            try {
                System.out.println("path: " + request.getServletPath());
                String requestData = request.getReader().lines().collect(Collectors.joining());
                System.out.println("requestdata: " + requestData);
                response.setContentType("application/json");
                JSONObject json = (JSONObject) new JSONParser().parse(requestData);
                String path = "/test_data/" + json.get("id") + "_" + json.get("startDate") + "_" + json.get("endDate") + ".json";
                System.out.println("Reading test data from: " + path);

                output = new Scanner(this.getClass().getResourceAsStream(path), "UTF-8").useDelimiter("\\A").next();
                System.out.println("test data: " + output);

                status = HttpServletResponse.SC_OK;
            } catch (Exception e) {
                System.out.println("excpetion " + e);
                output = "Exception " + e;
            }

            response.setStatus(status);
            response.getWriter().write(output);
        }
    }

    @Before
    public void setUp() throws Exception {

        int port = new Random().nextInt(1000) + 9000;
        System.out.println("port: " + port);

        server = new Server(port);
        ServletContextHandler context = new ServletContextHandler();
        ServletHolder holder = new ServletHolder(new TestServlet());
        context.addServlet(holder, "/getData");
        server.setHandler(context);

        server.start();

        String endpoint = "http://localhost:" + port + "/";

    }

    @After
    public void close() throws Exception {
        server.stop();
    }


    @Test
    public void txnSearchCallsAPIAndReturnsResult() throws Exception {
         // ...
    }

}