How to test a REST API that uses Retrofit and Dagger2

I would like to create a unit test that verifies that the api successfully gets the List of Repos. I would like that the test actually makes the network connection instead of using a Mock Server. And also would be good to use RoboElectric for example so the test can run on the JVM.

This to test the Model from the MVP architecture. I am using a sample project from Mosby , this uses Dagger 2 and Retrofit 1.9

public interface GithubApi {

@GET("/repositories")
@Headers("Cache-Control: no-cache")
public void getRepos(Callback<List<Repo>> callback);
}

This is the module

@Module(
)
public class SampleModule {

@Provides @Singleton public GithubApi providesGithubApi() {

OkHttpClient client = new OkHttpClient();
client.setCache(new Cache(context.getCacheDir(), 10 * 1024 * 1024));

RestAdapter restAdapter = new RestAdapter.Builder()
    .setClient(new OkClient(client))
    .setEndpoint("https://api.github.com")
    .build();

return restAdapter.create(GithubApi.class);
  }
}