java-tutorials/play-framework/introduction/test/ApplicationTest.java

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Arrays;

import org.json.JSONArray;
import org.json.JSONObject;
import org.junit.Before;
import org.junit.Test;
import model.Student;
import play.test.*;
import static play.test.Helpers.*;

public class ApplicationTest{
    private static final String BASE_URL = "http://localhost:9000";

	@Test
public void testInServer() throws Exception {
    TestServer server = testServer(3333);
    running(server, () -> {
        try {
            WSClient ws = play.libs.ws.WS.newClient(3333);
            CompletionStage<WSResponse> completionStage = ws.url("/").get();
            WSResponse response = completionStage.toCompletableFuture().get();
            ws.close();
            assertEquals(OK, response.getStatus());
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
        }
    });
}
    @Test
    public void whenCreatesRecord_thenCorrect() {
        Student student = new Student("jody", "west", 50);
        JSONObject obj = new JSONObject(makeRequest(BASE_URL, "POST", new JSONObject(student)));
        assertTrue(obj.getBoolean("isSuccessfull"));
        JSONObject body = obj.getJSONObject("body");
        assertEquals(student.getAge(), body.getInt("age"));
        assertEquals(student.getFirstName(), body.getString("firstName"));
        assertEquals(student.getLastName(), body.getString("lastName"));
    }

    @Test
    public void whenDeletesCreatedRecord_thenCorrect() {
        Student student = new Student("Usain", "Bolt", 25);
        JSONObject ob1 = new JSONObject(makeRequest(BASE_URL, "POST", new JSONObject(student))).getJSONObject("body");
        int id = ob1.getInt("id");
        JSONObject obj1 = new JSONObject(makeRequest(BASE_URL + "/" + id, "POST", new JSONObject()));
        assertTrue(obj1.getBoolean("isSuccessfull"));
        makeRequest(BASE_URL + "/" + id, "DELETE", null);
        JSONObject obj2 = new JSONObject(makeRequest(BASE_URL + "/" + id, "POST", new JSONObject()));
        assertFalse(obj2.getBoolean("isSuccessfull"));
    }

    @Test
    public void whenUpdatesCreatedRecord_thenCorrect() {
        Student student = new Student("john", "doe", 50);
        JSONObject body1 = new JSONObject(makeRequest(BASE_URL, "POST", new JSONObject(student))).getJSONObject("body");
        assertEquals(student.getAge(), body1.getInt("age"));
        int newAge = 60;
        body1.put("age", newAge);
        JSONObject body2 = new JSONObject(makeRequest(BASE_URL, "PUT", body1)).getJSONObject("body");
        assertFalse(student.getAge() == body2.getInt("age"));
        assertTrue(newAge == body2.getInt("age"));
    }

    @Test
    public void whenGetsAllRecords_thenCorrect() {
        Student student1 = new Student("jane", "daisy", 50);
        Student student2 = new Student("john", "daniel", 60);
        Student student3 = new Student("don", "mason", 55);
        Student student4 = new Student("scarlet", "ohara", 90);

        makeRequest(BASE_URL, "POST", new JSONObject(student1));
        makeRequest(BASE_URL, "POST", new JSONObject(student2));
        makeRequest(BASE_URL, "POST", new JSONObject(student3));
        makeRequest(BASE_URL, "POST", new JSONObject(student4));

        JSONObject objects = new JSONObject(makeRequest(BASE_URL, "GET", null));
        assertTrue(objects.getBoolean("isSuccessfull"));
        JSONArray array = objects.getJSONArray("body");
        assertTrue(array.length() >= 4);
    }

    public static String makeRequest(String myUrl, String httpMethod, JSONObject parameters) {

        URL url = null;
        try {
            url = new URL(myUrl);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        HttpURLConnection conn = null;
        try {

            conn = (HttpURLConnection) url.openConnection();
        } catch (IOException e) {
            e.printStackTrace();
        }
        conn.setDoInput(true);

        conn.setReadTimeout(10000);

        conn.setRequestProperty("Content-Type", "application/json");
        DataOutputStream dos = null;
        int respCode = 0;
        String inputString = null;
        try {
            conn.setRequestMethod(httpMethod);

            if (Arrays.asList("POST", "PUT").contains(httpMethod)) {
                String params = parameters.toString();

                conn.setDoOutput(true);

                dos = new DataOutputStream(conn.getOutputStream());
                dos.writeBytes(params);
                dos.flush();
                dos.close();
            }
            respCode = conn.getResponseCode();
            if (respCode != 200 && respCode != 201) {
                String error = inputStreamToString(conn.getErrorStream());
                return error;
            }
            inputString = inputStreamToString(conn.getInputStream());

        } catch (IOException e) {

            e.printStackTrace();
        }
        return inputString;
    }

    public static String inputStreamToString(InputStream is) {
        BufferedReader br = null;
        StringBuilder sb = new StringBuilder();

        String line;
        try {

            br = new BufferedReader(new InputStreamReader(is));
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        return sb.toString();

    }
}