Mocking Unirest with mockito

Question

I am in my starting programming phase and I wanted to ask about mocking Objects with Mockito, more specifically is the Unirest response. Let's say I have a database, and I dont what to bother it every time I do testing, and I want to use Mockito for that, but the problem is I am not sure how to create the fake "httpResponse" object that will come back. To give some context, I have attached my code:

    /**
 * This method lists the ID of the activity when requested.
 *
 * @return the list of all activities
 */
public  JSONArray getActivites() {
    HttpResponse<JsonNode> jsonResponse = null;
    try {
        jsonResponse = Unirest
                .get("http://111.111.111.111:8080/activity")
                .header("accept", "application/json")
                .asJson();
    } catch (UnirestException e) {
        System.out.println("Server is unreachable");
    }

    JSONArray listOfActivities = jsonResponse.getBody().getArray();
    return listOfActivities;
}

So what I had in mind, is to mock Unirest, and then when a .get method gets invoked, I would return a fake HttpResponse, problem is, I am not sure how to, I have looked online and couldn't really make much sense of it. Is it possible to do it 1 time with the actual Database, and then "Extract" the information and to use that every time for testing?

Answer 1

Sample Snippet with PowerMockRunner, PowerMockito and Mockito

@RunWith(PowerMockRunner.class)
    @PrepareForTest({ Unirest.class})
    public class TestApp{

      @Before
      public void setup() {
        PowerMockito.mockStatic(Unirest.class);
      }

      @Test
      public void shouldTestgetActivites() throws UnirestException {
        when(Unirest.get(Client.DEFAULT_BASE_URL)).thenReturn(getRequest);
        when(getRequest.asJson()).thenReturn(httpResponse);
        when(httpResponse.getStatus()).thenReturn(Integer.valueOf(200));

        assertThat(something).isEqualTo(true);
      }

    }

Answer 2

Instead of directly calling a static member, you could wrap the call in a wrapper class that can supply an HttpResponse based on some arguments. This is an interface that can easily be mocked in Mockito.

/**
 * This is a wrapper around a Unirest API.
 */
class UnirestWrapper {

    private HttpResponse<JsonNode> getResponse(String accept, String url) {
        try {
            return Unirest
                .get(url)
                .header("accept", accept)
                .asJson();
        } catch (UnirestException e) {
            System.out.println("Server is unreachable");
        }
        // Or create a NULL HttpResponse instance.
        return null;
    }
}

private final UnirestWrapper unirestWrapper;

ThisClassConstructor(UnirestWrapper unirestWrapper) {
    this.unirestWrapper = unirestWrapper;
}

/**
 * This method lists the ID of the activity when requested.
 *
 * @return the list of all activities
 */
public JSONArray getActivites() {
    HttpResponse<JsonNode> jsonResponse = this.unirestWrapper.getResponse("http://111.111.111.111:8080/activity", "application/json");

    if (jsonResponse == null) {
        return null;
    }

    JSONArray listOfActivities = jsonResponse.getBody().getArray();
    return listOfActivities;
}

Or you could use power mocks...