olegosipenko

private val fragmentViewModel: EmailLoginFragmentViewModel by viewModel()

olegosipenko

class KoinTestApp: Application() {
  override fun onCreate() {
    super.onCreate()
    startKoin {
      androidLogger()
      androidContext(this@KoinTestApp)
      modules(emptyList())
    }
  }
  

olegosipenko

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

olegosipenko

android {
  defaultConfig {
    …
    …
    testInstrumentationRunner "path.to.your.package.KoinTestRunner"
  }
}

olegosipenko

android {
  testOptions {
    animationsDisabled = true
  }
}

olegosipenko

abstract class FragmentTestRule<F: Fragment>: ActivityTestRule<FragmentActivity>(FragmentActivity::class.java, true) {
  override fun afterActivityLaunched() {
    super.afterActivityLaunched()
    activity.runOnUiThread {
      val fm = activity.supportFragmentManager
      val transaction = fm.beginTransaction()
      transaction.replace(
        android.R.id.content, 
        createFragment()
      ).commit()

olegosipenko

<?xml version="1.0" encoding="utf-8"?>
<manifest
  xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.github.olegosipenko.kointestsample">
  <application>
    <activity
      android:theme="@style/AppTheme"
      android:name="androidx.fragment.app.FragmentActivity"/>
  </application>
</manifest>

olegosipenko

@RunWith(AndroidJUnit4ClassRunner::class)
class EmailLoginFragmentTest {

  private val fragmentViewModel: EmailLoginFragmentViewModel = mockk(relaxed = true)
  private val fragment = EmailLoginFragment()

  @get:Rule
  val fragmentRule = createRule(fragment, module {
    single(override = true) {
      fragmentViewModel

olegosipenko

sealed class Expr

data class Const(val number: Double) : Expr()

data class Sum(val e1: Expr, val e2: Expr) : Expr()

object NotANumber : Expr()

fun eval(expr: Expr): Double = when(expr) {
  is Const -> expr.number

olegosipenko

sealed class EmailLoginViewState {
  object INITIAL: EmailLoginViewState()
  object LOADING: EmailLoginViewState()
  object SUCCESS: EmailLoginViewState()
  ...
}