Sample TestApplication class https://hackernoon.com/yet-another-mvp-article-part-5-writing-test-using-a-mixture-of-dagger-and-espresso-15c638182706

MarvelTestApplication.java

package com.mirhoseini.marvel;

/*...*/

public class MarvelTestApplication extends MarvelApplicationImpl {

    @Override
    public ApplicationTestComponent createComponent() {
        return DaggerApplicationTestComponent
                .builder()
                .androidModule(new AndroidModule(this))
                // replace Api Module with Mocked one
                .apiModule(new ApiTestModule())
                .build();
    }

}