NewFablePresenterTest.java

package intrepid.io.fable;

import org.junit.Before;
import org.junit.Test;
import org.mockito.ArgumentCaptor;
import org.mockito.Captor;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import intrepid.io.fable.rest.CreateStoryRequest;
import intrepid.io.fable.rest.CreateStoryResponse;
import intrepid.io.fable.rest.RestApi;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

public class NewFablePresenterTest {

    @Mock
    NewFableContract.View mockView;

    @Mock
    RestApi mockRestApi;

    @Mock
    Call<CreateStoryResponse> mockCall;

    @Captor
    ArgumentCaptor<Callback<CreateStoryResponse>> responseArgumentCaptor;

    @Before
    public void setup() {
        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void onSubmitClickedTest() {
        NewFablePresenter presenter = new NewFablePresenter(mockView, mockRestApi);
        when(mockRestApi.createStory(any(CreateStoryRequest.class))).thenReturn(mockCall);
        presenter.onSubmitClicked();

        verify(mockCall).enqueue(responseArgumentCaptor.capture());


        final Response<CreateStoryResponse> success = Response.success(new CreateStoryResponse());
        responseArgumentCaptor.getValue().onResponse(mockCall, success);
        verify(mockView).fableCreated(eq(success.body()));

        responseArgumentCaptor.getValue().onFailure(mockCall, any(Throwable.class));
        verify(mockView).showErrorMessage(R.string.error);
    }
}