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@Module
class TestApplicationModule(
        private val userRepository: UserRepository = FakeUserRepository(),
        private val detailsRepository: DetailsRepository = FakeDetailsRepository()) {

    @Provides
    @Singleton
    fun provideUserRepository(): UserRepository {
        return userRepository
    }

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@Before
fun setUp() {
    MockitoAnnotations.initMocks(this)

    TestInjector(TestApplicationModule(mockUserRepository)).inject()
}

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class TestInjector(private val testApplicationModule: TestApplicationModule) {

    fun inject() {
        val instrumentation = InstrumentationRegistry.getInstrumentation()
        val app = instrumentation.targetContext.applicationContext as TestApplication

        DaggerTestApplicationComponent
                .builder()
                .appModule(testApplicationModule)
                .create(app)

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@RunWith(AndroidJUnit4::class)
class UserListFragmentTest {

    @Rule
    @JvmField
    var activityRule = ActivityTestRule(MainActivity::class.java, true, false)

    @Mock
    private lateinit var mockUserRepository: UserRepository

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android {
    compileSdkVersion 27
    buildToolsVersion "27.0.3"
    defaultConfig {
        applicationId "com.example.tamaskozmer.kotlinrxexample"
        minSdkVersion 16
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "com.example.tamaskozmer.kotlinrxexample.testutil.CustomTestRunner"

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class CustomTestRunner : AndroidJUnitRunner() {

    override fun newApplication(cl: ClassLoader?, className: String?, context: Context?): Application {
        return super.newApplication(cl, TestApplication::class.java.name, context)
    }
}

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class TestApplication : Application(), HasSupportFragmentInjector {

    @Inject
    lateinit var fragmentInjector: DispatchingAndroidInjector<Fragment>

    override fun supportFragmentInjector() = fragmentInjector
}

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class CustomApplication : DaggerApplication() {

    override fun applicationInjector(): AndroidInjector<out DaggerApplication> {
        return DaggerApplicationComponent.builder().create(this)
    }
}

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@RunWith(AndroidJUnit4::class)
class UserListFragmentTest {

    @Rule
    @JvmField
    var activityRule = ActivityTestRule(MainActivity::class.java, true, false)

    @Mock
    private lateinit var mockUserRepository: UserRepository

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class CustomApplication : Application() {

    lateinit var component: ApplicationComponent

    override fun onCreate() {
        super.onCreate()

        component = DaggerApplicationComponent
            .builder()
            .applicationModule(ApplicationModule(this))