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...
((MyApplication) getApplication())
    .getMyComponent()
    .inject(MainActivity.this);
...

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...
public class MyApplication extends Application {

    private MyComponent mMyComponent;

    @Override
    public void onCreate() {
        super.onCreate();
        mMyComponent = createMyComponent();
    }

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void setMyComponent(MyComponent myComponent) {
    mMyComponent = myComponent;
}

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package com.larkintuckerllc.dagger.mocks;

import com.larkintuckerllc.dagger.MyComponent;
import javax.inject.Singleton;
import dagger.Component;

@Singleton
@Component(modules = MyModuleMock.class)
public interface MyComponentMock extends MyComponent {
}

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package com.larkintuckerllc.dagger.mocks;

import com.larkintuckerllc.dagger.MyExample;

import javax.inject.Singleton;
import dagger.Module;
import dagger.Provides;

@Module
public class MyModuleMock {

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package com.larkintuckerllc.dagger.mocks;

import com.larkintuckerllc.dagger.MyExample;

import java.util.Date;

public class MyExampleImplMock implements MyExample {

    public long getDate() {
        return 0;

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...
@RunWith(AndroidJUnit4.class)
@LargeTest
public class MainActivityTest {

    @Rule
    public ActivityTestRule<MainActivity> mActivityTestRule = new ActivityTestRule<MainActivity>(MainActivity.class) {

        @Override
        protected void beforeActivityLaunched() {

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...
@Module
class MyModule {

    @Provides
    @Singleton
    static MyExample provideMyExample() {
        return new MyExampleImpl();
    }

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...
@Singleton
@Component(modules = MyModule.class)
interface MyComponent {

    void inject(MainActivity mainActivity);

}

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...
public class MyApplication extends Application {

   static private AppComponent sAppComponent;
   static private AuthComponent sAuthComponent;

   @Override
   public void onCreate() {
      super.onCreate();
      sAppComponent = DaggerAppComponent.create();