Test method with okhttp3 call

Question

I have a method in the service class that makes a call to an external api. How would I mock this okHttpClient call? I have tried to do so with mockito but no luck with that.

//this is the format of the method that i want to test
public string sendMess(EventObj event) {
    OkHttpClient client = new OkHttpClient();
    //build payload using the information stored in the payload object
    ResponseBody body = 
        RequestBody.create(MediaType.parse("application/json"), payload);
    Request request = //built using the Requestbody
    //trying to mock a response from execute
    Response response = client.newCall(request).execute();
    //other logic
}

I am open to refactoring the service class if it helps with the testing. Any suggestions and recommendation is appreciated. Thanks.

Answer 1

Since you are using spring-boot leave managing beans to spring.

1) First create OkHttpClient as spring bean so that you can use it all over application

@Configuration
public class Config {

@Bean
public OkHttpClient okHttpClient() {
    return new OkHttpClient();
    }
 }

2) And then in the service class @Autowire OkHttpClient and use it

@Service
public class SendMsgService {

@Autowired
private OkHttpClient okHttpClient;

 public string sendMess(EventObj event) {

ResponseBody body =  RequestBody.create(MediaType.parse("application/json"), payload);
Request request = //built using the Requestbody
//trying to mock a response from execute
Response response = okHttpClient.newCall(request).execute();
//other logic
   }
 }

Tests

3) Now in the Test classes use @SpringBootTest,@RunWith(SpringRunner.class) and @MockBean

The @SpringBootTest annotation can be used when we need to bootstrap the entire container. The annotation works by creating the ApplicationContext that will be utilized in our tests.

@RunWith(SpringRunner.class) is used to provide a bridge between Spring Boot test features and JUnit. Whenever we are using any Spring Boot testing features in out JUnit tests, this annotation will be required.

@MockBean Annotation that can be used to add mocks to a Spring ApplicationContext.

@SpringBootTest
@RunWith(SpringRunner.class)
public class ServiceTest {

 @Autowire
 private SendMsgService sendMsgService;

 @MockBean
 private OkHttpClient okHttpClient;

  @Test
  public void testSendMsg(){

 given(this.okHttpClient.newCall(ArgumentMatchers.any())
            .execute()).willReturn(String);

  EventObj event = //event object
 String result = sendMsgService.sendMess(event);

  }
 }