dagger2 component - https://proandroiddev.com/unit-tests-with-dagger2-retrofit2-rxjava2-and-mockk-android-1c268fa77957

ApplicationComponent.kt

@Singleton
@Component(
    modules = [
        (ApplicationModule::class)
    ]
)
interface ApplicationComponent {
    fun inject(into: GDelegate)
    fun inject(into: BaseRepository)
    fun inject(into: BaseViewModel)
}