LordRaydenMK

sealed class NotificationSetting
object Disabled : NotificationSettings()    // an object has one element -> cardinality = 1
data class Enabled(val pushEnabled: Boolean, val emailEnabled: Boolean) : NotificationSettings()

// cardinality = cardinality (Disabled)  + cardinality(Enabled)
// cardinality = 1 + (2 * 2)
// cardinality = 1 + 4 = 5

sealed class Location
object Unknown : Location()

LordRaydenMK

@Test
fun `execute - first call succeeds, one failed call to #2 - one full item, one item with default value`() {
    val items = listOf("Item 1" to "https://item1.jpg", "Item 2" to "invalid url")
    val service = successService(items)

    val viewModel = ViewModel(service)

    val expected = listOf(
        ViewEntity("Item 1", "https://item1.jpg".toHttpUrl()),
        ViewEntity("Item 2", null)

LordRaydenMK

@Test
fun `execute - first call succeeds, one failed call to #2 - one full item, one item with default value`() {
    val items = listOf("Item 1" to "https://item1.jpg", "Item 2" to "invalid url")
    val service = successService(items) // Fake implementation of a retrofit service, always returns success

    val viewModel = ViewModel(service)

    val expected = listOf(
        ViewEntity("Item 1", "https://item1.jpg".toHttpUrl()),
        ViewEntity("Item 2", null)

LordRaydenMK

// Emits Loading then Content or Problem
private fun requestData(): Observable<ViewState> =
    service.firstApiCall()
        .observeOn(Schedulers.computation())
        .map { it.message }
        .flatMap(this::secondApiCall)
        .map<ViewState> { ViewState.Content(it) }
        .startWith(Single.just(ViewState.Loading))
        .onErrorReturn { ViewState.Problem }
        .toObservable()

LordRaydenMK

sealed class Result<out A> {
    data class Success<A>(val value: A) : Result<A>()
    data class Failure(val msg: String) : Result<Nothing>()

    companion object {

        fun <A> success(value: A): Result<A> = Success(value)

        fun <A> failure(msg: String): Result<A> = Failure(msg)
    }

LordRaydenMK

package io.github.lordraydenmk.hangman

import arrow.fx.IO
import arrow.fx.extensions.fx
import arrow.fx.flatMap
import java.io.IOException
import kotlin.random.Random
import kotlin.streams.toList

// region utils

LordRaydenMK

@Retention(AnnotationRetention.BINARY)
@Target(AnnotationTarget.CLASS)
annotation class ValueClass

LordRaydenMK

package io.github.lordraydenmk.tf

import arrow.Kind
import arrow.core.getOrElse
import arrow.core.right
import arrow.core.toOption
import arrow.effects.IO
import arrow.effects.SingleK
import arrow.effects.fix
import arrow.effects.instances.io.monad.flatMap

LordRaydenMK

@Module
public class NetworkModule {

    @Provides
    OkHttpClient provideOkHttpClient() {
        return new OkHttpClient.Builder()
                .build();
    }
}

LordRaydenMK

public class MyAwesomeClass {

    private final MyClass myClass;

    @Inject
    public MyAwesomeClass(MyClass myClass) {
        this.myClass = myClass;
    }
}