@Test
  public void testApp() throws IOException {
    mockWebServer.enqueue(new MockResponse(200, Headers.of(), "Hello, Maven!"));
    mockWebServer.start();

    new SampleHttpClient().makeCall(mockWebServer.url("/"));
  }

import okhttp3.Response;

public class SampleHttpClient {
  private final OkHttpClient client;

  public SampleHttpClient() {
    client = new OkHttpClient.Builder().build();
  }

  public void makeCall(HttpUrl url) throws IOException {
    try (Response response = client.newCall(new Request(url, Headers.EMPTY, "GET", null)).execute()) {
      System.out.println(response.body().string());
    }
  }