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class MainApplication : Application() {

    @Inject
    lateinit var daggerHouse: DaggerHouse

    override fun onCreate() {
        super.onCreate()

        DaggerDaggerComponent.create().inject(this)
        daggerHouse.door.open()

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@Component(modules = [DaggerModule::class])
interface DaggerComponent {

    fun house(): DaggerHouse

    fun door(): Door

    fun inject(mainApplication: MainApplication)
}

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@Module
class DaggerModule {

    @Provides
    fun providesHouse(door: Door): DaggerHouse = DaggerHouse(door)

    @Provides
    fun providesDoor() : Door = DoorImpl()
}

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class DaggerHouse @Inject constructor(val door: Door)

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class MainApplication : Application() {

    lateinit var house: House

    override fun onCreate() {
        super.onCreate()

        house = House()
        house.door.open()
    }

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class House {

    val door: Door = DoorImpl()
}

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interface Door {
    fun open()
}

class DoorImpl : Door {

    override fun open() {
        Log.println(Log.VERBOSE, null, "Opening door")
    }
}

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package com.example.sherryuan.moviesdb

import android.arch.persistence.room.Room
import android.support.test.InstrumentationRegistry
import android.support.test.runner.AndroidJUnit4
import com.example.sherryuan.moviesdb.database.MovieDao
import com.example.sherryuan.moviesdb.database.MovieDb
import com.example.sherryuan.moviesdb.models.Movie
import org.junit.*
import org.junit.runner.RunWith

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val movieById1 = movieDao.findById(1).blockingFirst()
Assert.assertEquals(movieById1[0].title, movie1.title)

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    @After
    fun closeDb() {
        testDatabase.close()
    }

    @Test
    fun testMovieDaoQueries() {
        val movie1 = Movie(1, "Batman Begins", "first movie", 3)
        movieDao.insert(movie1)