Final Results

Our app/build.gradle file with the updated dependencies list should resemble:

plugins {
  id 'com.android.application'
  id 'kotlin-android'
  id 'androidx.navigation.safeargs.kotlin'
  id 'kotlin-kapt'
}

android {
  compileSdk 31

  defaultConfig {
    applicationId "com.commonsware.todo"
    minSdk 21
    targetSdk 31
    versionCode 1
    versionName "1.0"

    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
  }

  buildTypes {
    release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
  }

  buildFeatures {
    viewBinding true
  }

  compileOptions {
    coreLibraryDesugaringEnabled true
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }

  kotlinOptions {
    jvmTarget = '1.8'
  }
}

dependencies {
  implementation 'androidx.core:core-ktx:1.6.0'
  implementation 'androidx.appcompat:appcompat:1.3.1'
  implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
  implementation "androidx.recyclerview:recyclerview:1.2.1"
  implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
  implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
  implementation 'com.google.android.material:material:1.4.0'
  implementation "io.insert-koin:koin-android:$koin_version"
  implementation "androidx.room:room-runtime:$room_version"
  implementation "androidx.room:room-ktx:$room_version"
  kapt "androidx.room:room-compiler:$room_version"
  coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'
  testImplementation 'junit:junit:4.13.2'
  testImplementation "org.mockito:mockito-inline:3.12.1"
  testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0"
  testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.5.1'
  androidTestImplementation 'androidx.test.ext:junit:1.1.3'
  androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

(from T24-Tests/ToDo/app/build.gradle)

And our SingleModelMotorTest should look like:

package com.commonsware.todo.ui

import com.commonsware.todo.MainDispatcherRule
import com.commonsware.todo.repo.ToDoModel
import com.commonsware.todo.repo.ToDoRepository
import com.nhaarman.mockitokotlin2.doReturn
import com.nhaarman.mockitokotlin2.mock
import com.nhaarman.mockitokotlin2.verify
import kotlinx.coroutines.flow.first
import kotlinx.coroutines.flow.flowOf
import kotlinx.coroutines.runBlocking
import org.junit.Assert.assertEquals
import org.junit.Before
import org.junit.Rule
import org.junit.Test

class SingleModelMotorTest {
  @get:Rule
  val mainDispatcherRule = MainDispatcherRule(paused = true)

  private val testModel = ToDoModel("this is a test")

  private val repo: ToDoRepository = mock {
    on { find(testModel.id) } doReturn flowOf(testModel)
  }

  private lateinit var underTest: SingleModelMotor

  @Before
  fun setUp() {
    underTest = SingleModelMotor(repo, testModel.id)
  }

  @Test
  fun `initial state`() {
    mainDispatcherRule.dispatcher.runCurrent()

    runBlocking {
      val item = underTest.states.first().item

      assertEquals(testModel, item)
    }
  }

  @Test
  fun `actions pass through to repo`() {
    val replacement = testModel.copy("whatevs")

    underTest.save(replacement)
    mainDispatcherRule.dispatcher.runCurrent()

    runBlocking { verify(repo).save(replacement) }

    underTest.delete(replacement)
    mainDispatcherRule.dispatcher.runCurrent()

    runBlocking { verify(repo).delete(replacement) }
  }
}

(from T24-Tests/ToDo/app/src/test/java/com/commonsware/todo/ui/SingleModelMotorTest.kt)

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