Merge pull request #83 from kirmanak/improve-onboarding

Improve onboarding experience

app/build.gradle.kts

@@ -122,6 +122,7 @@ dependencies {
     testImplementation(libs.robolectric)
 
     testImplementation(libs.androidx.test.junit)
+    testImplementation(libs.androidx.coreTesting)
 
     testImplementation(libs.google.truth)
 

app/src/main/java/gq/kirmanak/mealient/extensions/FlowExtensions.kt

@@ -0,0 +1,23 @@
+package gq.kirmanak.mealient.extensions
+
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.FlowCollector
+
+fun <T> Flow<T>.valueUpdatesOnly(): Flow<T> = when (this) {
+    is ValueUpdateOnlyFlowImpl<T> -> this
+    else -> ValueUpdateOnlyFlowImpl(this)
+}
+
+private class ValueUpdateOnlyFlowImpl<T>(private val upstream: Flow<T>) : Flow<T> {
+
+    override suspend fun collect(collector: FlowCollector<T>) {
+        var previousValue: T? = null
+        upstream.collect { value ->
+            if (previousValue != null && previousValue != value) {
+                collector.emit(value)
+            }
+            previousValue = value
+        }
+    }
+
+}

app/src/main/java/gq/kirmanak/mealient/extensions/FragmentExtensions.kt

@@ -1,16 +1,27 @@
 package gq.kirmanak.mealient.extensions
 
+import android.widget.Toast
+import androidx.annotation.StringRes
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.lifecycleScope
-import kotlinx.coroutines.CoroutineScope
+import androidx.lifecycle.repeatOnLifecycle
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.FlowCollector
+import kotlinx.coroutines.launch
 
-fun <T> Fragment.collectWhenViewResumed(
-    flow: Flow<T>,
-    collector: FlowCollector<T>,
-) = launchWhenViewResumed { flow.collect(collector) }
+fun <T> Fragment.collectWhenViewResumed(flow: Flow<T>, collector: FlowCollector<T>) {
+    viewLifecycleOwner.lifecycleScope.launch {
+        viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.RESUMED) {
+            flow.collect(collector)
+        }
+    }
+}
 
-fun Fragment.launchWhenViewResumed(
-    block: suspend CoroutineScope.() -> Unit,
-) = viewLifecycleOwner.lifecycleScope.launchWhenResumed(block)
+fun Fragment.showLongToast(@StringRes text: Int) = showLongToast(getString(text))
+
+fun Fragment.showLongToast(text: String) = showToast(text, Toast.LENGTH_LONG)
+
+private fun Fragment.showToast(text: String, length: Int): Boolean {
+    return context?.let { Toast.makeText(it, text, length).show() } != null
+}

app/src/main/java/gq/kirmanak/mealient/ui/recipes/RecipeViewModel.kt

@@ -1,15 +1,40 @@
 package gq.kirmanak.mealient.ui.recipes
 
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import androidx.paging.cachedIn
 import dagger.hilt.android.lifecycle.HiltViewModel
+import gq.kirmanak.mealient.data.auth.AuthRepo
 import gq.kirmanak.mealient.data.recipes.RecipeRepo
+import gq.kirmanak.mealient.extensions.valueUpdatesOnly
+import gq.kirmanak.mealient.logging.Logger
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import javax.inject.Inject
 
 @HiltViewModel
-class RecipeViewModel @Inject constructor(recipeRepo: RecipeRepo) : ViewModel() {
+class RecipeViewModel @Inject constructor(
+    recipeRepo: RecipeRepo,
+    authRepo: AuthRepo,
+    private val logger: Logger,
+) : ViewModel() {
 
     val pagingData = recipeRepo.createPager().flow.cachedIn(viewModelScope)
 
+    private val _isAuthorized = MutableLiveData<Boolean?>(null)
+    val isAuthorized: LiveData<Boolean?> = _isAuthorized
+
+    init {
+        authRepo.isAuthorizedFlow.valueUpdatesOnly().onEach {
+            logger.v { "Authorization state changed to $it" }
+            _isAuthorized.postValue(it)
+        }.launchIn(viewModelScope)
+    }
+
+    fun onAuthorizationChangeHandled() {
+        logger.v { "onAuthorizationSuccessHandled() called" }
+        _isAuthorized.postValue(null)
+    }
 }

app/src/main/java/gq/kirmanak/mealient/ui/recipes/RecipesFragment.kt

@@ -2,21 +2,31 @@ package gq.kirmanak.mealient.ui.recipes
 
 import android.os.Bundle
 import android.view.View
+import androidx.annotation.StringRes
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
 import androidx.fragment.app.viewModels
 import androidx.navigation.fragment.findNavController
+import androidx.paging.LoadState
+import androidx.paging.PagingDataAdapter
+import androidx.recyclerview.widget.RecyclerView
 import by.kirich1409.viewbindingdelegate.viewBinding
 import dagger.hilt.android.AndroidEntryPoint
 import gq.kirmanak.mealient.R
 import gq.kirmanak.mealient.database.recipe.entity.RecipeSummaryEntity
 import gq.kirmanak.mealient.databinding.FragmentRecipesBinding
+import gq.kirmanak.mealient.datasource.NetworkError
 import gq.kirmanak.mealient.extensions.collectWhenViewResumed
 import gq.kirmanak.mealient.extensions.refreshRequestFlow
+import gq.kirmanak.mealient.extensions.showLongToast
+import gq.kirmanak.mealient.extensions.valueUpdatesOnly
 import gq.kirmanak.mealient.logging.Logger
 import gq.kirmanak.mealient.ui.activity.MainActivityViewModel
-import gq.kirmanak.mealient.ui.recipes.images.RecipeImageLoader
 import gq.kirmanak.mealient.ui.recipes.images.RecipePreloaderFactory
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.filterIsInstance
+import kotlinx.coroutines.flow.map
 import javax.inject.Inject
 
 @AndroidEntryPoint
@@ -29,9 +39,6 @@ class RecipesFragment : Fragment(R.layout.fragment_recipes) {
     @Inject
     lateinit var logger: Logger
 
-    @Inject
-    lateinit var recipeImageLoader: RecipeImageLoader
-
     @Inject
     lateinit var recipePagingAdapterFactory: RecipesPagingAdapter.Factory
 
@@ -51,34 +58,64 @@ class RecipesFragment : Fragment(R.layout.fragment_recipes) {
         logger.v { "navigateToRecipeInfo() called with: recipeSummaryEntity = $recipeSummaryEntity" }
         findNavController().navigate(
             RecipesFragmentDirections.actionRecipesFragmentToRecipeInfoFragment(
-                recipeSlug = recipeSummaryEntity.slug,
-                recipeId = recipeSummaryEntity.remoteId
+                recipeSlug = recipeSummaryEntity.slug, recipeId = recipeSummaryEntity.remoteId
             )
         )
     }
 
     private fun setupRecipeAdapter() {
         logger.v { "setupRecipeAdapter() called" }
-        val recipesAdapter = recipePagingAdapterFactory.build(
-            recipeImageLoader = recipeImageLoader,
-            clickListener = ::navigateToRecipeInfo
-        )
+
+        val recipesAdapter = recipePagingAdapterFactory.build { navigateToRecipeInfo(it) }
+
         with(binding.recipes) {
             adapter = recipesAdapter
             addOnScrollListener(recipePreloaderFactory.create(recipesAdapter))
         }
+
         collectWhenViewResumed(viewModel.pagingData) {
             logger.v { "setupRecipeAdapter: received data update" }
             recipesAdapter.submitData(lifecycle, it)
         }
+
         collectWhenViewResumed(recipesAdapter.onPagesUpdatedFlow) {
             logger.v { "setupRecipeAdapter: pages updated" }
             binding.refresher.isRefreshing = false
         }
+
+        collectWhenViewResumed(recipesAdapter.appendPaginationEnd()) {
+            logger.v { "onPaginationEnd() called" }
+            showLongToast(R.string.fragment_recipes_last_page_loaded_toast)
+        }
+
+        collectWhenViewResumed(recipesAdapter.refreshErrors()) {
+            onLoadFailure(it)
+        }
+
         collectWhenViewResumed(binding.refresher.refreshRequestFlow(logger)) {
             logger.v { "setupRecipeAdapter: received refresh request" }
             recipesAdapter.refresh()
         }
+
+        viewModel.isAuthorized.observe(viewLifecycleOwner) { isAuthorized ->
+            logger.v { "setupRecipeAdapter: isAuthorized changed to $isAuthorized" }
+            if (isAuthorized != null) {
+                if (isAuthorized) recipesAdapter.refresh()
+                // else is ignored to avoid the removal of the non-public recipes
+                viewModel.onAuthorizationChangeHandled()
+            }
+        }
+    }
+
+    private fun onLoadFailure(error: Throwable) {
+        logger.w(error) { "onLoadFailure() called" }
+        val reason = error.toLoadErrorReasonText()?.let { getString(it) }
+        val toastText = if (reason == null) {
+            getString(R.string.fragment_recipes_load_failure_toast_no_reason)
+        } else {
+            getString(R.string.fragment_recipes_load_failure_toast, reason)
+        }
+        showLongToast(toastText)
     }
 
     override fun onDestroyView() {
@@ -87,4 +124,28 @@ class RecipesFragment : Fragment(R.layout.fragment_recipes) {
         // Prevent RV leaking through mObservers list in adapter
         binding.recipes.adapter = null
     }
-}
+}
+
+@StringRes
+private fun Throwable.toLoadErrorReasonText(): Int? = when (this) {
+    is NetworkError.Unauthorized -> R.string.fragment_recipes_load_failure_toast_unauthorized
+    is NetworkError.NoServerConnection -> R.string.fragment_recipes_load_failure_toast_no_connection
+    is NetworkError.NotMealie, is NetworkError.MalformedUrl -> R.string.fragment_recipes_load_failure_toast_unexpected_response
+    else -> null
+}
+
+private fun <T : Any, VH : RecyclerView.ViewHolder> PagingDataAdapter<T, VH>.refreshErrors(): Flow<Throwable> {
+    return loadStateFlow
+        .map { it.refresh }
+        .valueUpdatesOnly()
+        .filterIsInstance<LoadState.Error>()
+        .map { it.error }
+}
+
+private fun <T : Any, VH : RecyclerView.ViewHolder> PagingDataAdapter<T, VH>.appendPaginationEnd(): Flow<Unit> {
+    return loadStateFlow
+        .map { it.append.endOfPaginationReached }
+        .valueUpdatesOnly()
+        .filter { it }
+        .map { }
+}

app/src/main/java/gq/kirmanak/mealient/ui/recipes/RecipesPagingAdapter.kt

@@ -4,12 +4,12 @@ import android.view.LayoutInflater
 import android.view.ViewGroup
 import androidx.paging.PagingDataAdapter
 import androidx.recyclerview.widget.DiffUtil
+import dagger.hilt.android.scopes.FragmentScoped
 import gq.kirmanak.mealient.database.recipe.entity.RecipeSummaryEntity
 import gq.kirmanak.mealient.databinding.ViewHolderRecipeBinding
 import gq.kirmanak.mealient.logging.Logger
 import gq.kirmanak.mealient.ui.recipes.images.RecipeImageLoader
 import javax.inject.Inject
-import javax.inject.Singleton
 
 class RecipesPagingAdapter private constructor(
     private val logger: Logger,
@@ -18,19 +18,23 @@ class RecipesPagingAdapter private constructor(
     private val clickListener: (RecipeSummaryEntity) -> Unit
 ) : PagingDataAdapter<RecipeSummaryEntity, RecipeViewHolder>(RecipeDiffCallback) {
 
-    @Singleton
+    @FragmentScoped
     class Factory @Inject constructor(
         private val logger: Logger,
         private val recipeViewHolderFactory: RecipeViewHolder.Factory,
+        private val recipeImageLoader: RecipeImageLoader,
     ) {
 
-        fun build(
-            recipeImageLoader: RecipeImageLoader,
-            clickListener: (RecipeSummaryEntity) -> Unit,
-        ) = RecipesPagingAdapter(logger, recipeImageLoader, recipeViewHolderFactory, clickListener)
+        fun build(clickListener: (RecipeSummaryEntity) -> Unit) = RecipesPagingAdapter(
+            logger,
+            recipeImageLoader,
+            recipeViewHolderFactory,
+            clickListener
+        )
     }
 
     override fun onBindViewHolder(holder: RecipeViewHolder, position: Int) {
+        logger.d { "onBindViewHolder() called with: holder = $holder, position = $position" }
         val item = getItem(position)
         holder.bind(item)
     }

app/src/main/res/layout/fragment_authentication.xml

@@ -23,6 +23,8 @@
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_bias="0.1"
+		app:helperText="@string/fragment_authentication_email_input_helper_text"
+		app:helperTextEnabled="true"
 		app:layout_constraintVertical_chainStyle="packed">
 
 		<com.google.android.material.textfield.TextInputEditText
@@ -33,20 +35,22 @@
 	</com.google.android.material.textfield.TextInputLayout>
 
 	<com.google.android.material.textfield.TextInputLayout
-        android:id="@+id/password_input_layout"
-        style="@style/SmallMarginTextInputLayoutStyle"
-        android:hint="@string/fragment_authentication_input_hint_password"
-        app:layout_constraintBottom_toTopOf="@+id/button"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:endIconMode="password_toggle"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/email_input_layout">
+		android:id="@+id/password_input_layout"
+		style="@style/SmallMarginTextInputLayoutStyle"
+		android:hint="@string/fragment_authentication_input_hint_password"
+		app:layout_constraintBottom_toTopOf="@+id/button"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:endIconMode="password_toggle"
+		app:layout_constraintStart_toStartOf="parent"
+		app:helperText="@string/fragment_authentication_password_input_helper_text"
+		app:helperTextEnabled="true"
+		app:layout_constraintTop_toBottomOf="@+id/email_input_layout">
 
-        <com.google.android.material.textfield.TextInputEditText
-            android:id="@+id/password_input"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:inputType="textPassword" />
+		<com.google.android.material.textfield.TextInputEditText
+			android:id="@+id/password_input"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:inputType="textPassword" />
 	</com.google.android.material.textfield.TextInputLayout>
 
     <Button

app/src/main/res/layout/fragment_base_url.xml

@@ -1,42 +1,45 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".ui.baseurl.BaseURLFragment">
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	tools:context=".ui.baseurl.BaseURLFragment">
 
-    <com.google.android.material.progressindicator.LinearProgressIndicator
-        android:id="@+id/progress"
-        style="@style/IndeterminateProgress"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        tools:visibility="visible" />
+	<com.google.android.material.progressindicator.LinearProgressIndicator
+		android:id="@+id/progress"
+		style="@style/IndeterminateProgress"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toTopOf="parent"
+		tools:visibility="visible" />
 
-    <com.google.android.material.textfield.TextInputLayout
-        android:id="@+id/url_input_layout"
-        style="@style/SmallMarginTextInputLayoutStyle"
-        android:hint="@string/fragment_authentication_input_hint_url"
-        app:layout_constraintBottom_toTopOf="@+id/button"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_chainStyle="packed">
+	<com.google.android.material.textfield.TextInputLayout
+		android:id="@+id/url_input_layout"
+		style="@style/SmallMarginTextInputLayoutStyle"
+		android:hint="@string/fragment_authentication_input_hint_url"
+		app:helperText="@string/fragment_base_url_url_input_helper_text"
+		app:helperTextEnabled="true"
+		app:layout_constraintBottom_toTopOf="@+id/button"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toTopOf="parent"
+		app:layout_constraintVertical_bias="0.2"
+		app:layout_constraintVertical_chainStyle="packed">
 
-        <com.google.android.material.textfield.TextInputEditText
-            android:id="@+id/url_input"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:inputType="textUri" />
-    </com.google.android.material.textfield.TextInputLayout>
+		<com.google.android.material.textfield.TextInputEditText
+			android:id="@+id/url_input"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:inputType="textUri" />
+	</com.google.android.material.textfield.TextInputLayout>
 
-    <Button
-        android:id="@+id/button"
-        style="@style/SmallMarginButton"
-        android:text="@string/fragment_base_url_save"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/url_input_layout" />
+	<Button
+		android:id="@+id/button"
+		style="@style/SmallMarginButton"
+		android:text="@string/fragment_base_url_save"
+		app:layout_constraintBottom_toBottomOf="parent"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@+id/url_input_layout" />
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values-ru/strings.xml

@@ -38,4 +38,13 @@
 	<string name="fragment_add_recipe_save_error">Что-то пошло не так</string>
 	<string name="fragment_add_recipe_save_success">Рецепт сохранен успешно</string>
 	<string name="fragment_add_recipe_clear_button">Очистить</string>
+	<string name="fragment_base_url_url_input_helper_text">Пример: demo.mealie.io</string>
+	<string name="fragment_authentication_email_input_helper_text">Пример: changeme@email.com</string>
+	<string name="fragment_authentication_password_input_helper_text">Пример: demo</string>
+	<string name="fragment_recipes_last_page_loaded_toast">Последняя страница</string>
+	<string name="fragment_recipes_load_failure_toast">Ошибка загрузки: %1$s.</string>
+	<string name="fragment_recipes_load_failure_toast_unauthorized">неавторизован</string>
+	<string name="fragment_recipes_load_failure_toast_unexpected_response">неожиданный ответ</string>
+	<string name="fragment_recipes_load_failure_toast_no_connection">нет соединения</string>
+	<string name="fragment_recipes_load_failure_toast_no_reason">Ошибка загрузки.</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -42,4 +42,13 @@
 	<string name="fragment_add_recipe_save_error">Something went wrong</string>
 	<string name="fragment_add_recipe_save_success">Saved recipe successfully</string>
 	<string name="fragment_add_recipe_clear_button">Clear</string>
+	<string name="fragment_base_url_url_input_helper_text">Example: demo.mealie.io</string>
+	<string name="fragment_authentication_email_input_helper_text">Example: changeme@email.com</string>
+	<string name="fragment_authentication_password_input_helper_text">Example: demo</string>
+	<string name="fragment_recipes_last_page_loaded_toast">Last page loaded</string>
+	<string name="fragment_recipes_load_failure_toast" comment="EXAMPLE: Load error: unauthorized.">Load error: %1$s.</string>
+	<string name="fragment_recipes_load_failure_toast_no_reason">Load failed.</string>
+	<string name="fragment_recipes_load_failure_toast_unauthorized">unauthorized</string>
+	<string name="fragment_recipes_load_failure_toast_unexpected_response">unexpected response</string>
+	<string name="fragment_recipes_load_failure_toast_no_connection">no connection</string>
 </resources>

app/src/test/java/gq/kirmanak/mealient/extensions/FlowExtensionsKtTest.kt

@@ -0,0 +1,42 @@
+package gq.kirmanak.mealient.extensions
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.flow.toList
+import kotlinx.coroutines.test.runTest
+import org.junit.Test
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class FlowExtensionsKtTest {
+
+    @Test
+    fun `when flow has an update then valueUpdatesOnly sends updated value`() = runTest {
+        val flow = flowOf(1, 2)
+        assertThat(flow.valueUpdatesOnly().toList()).isEqualTo(listOf(2))
+    }
+
+    @Test
+    fun `when flow has repeated values then valueUpdatesOnly sends updated value`() = runTest {
+        val flow = flowOf(1, 1, 1, 2)
+        assertThat(flow.valueUpdatesOnly().toList()).isEqualTo(listOf(2))
+    }
+
+    @Test
+    fun `when flow has one value then valueUpdatesOnly is empty`() = runTest {
+        val flow = flowOf(1)
+        assertThat(flow.valueUpdatesOnly().toList()).isEmpty()
+    }
+
+    @Test
+    fun `when flow has two updates then valueUpdatesOnly sends both`() = runTest {
+        val flow = flowOf(1, 2, 1)
+        assertThat(flow.valueUpdatesOnly().toList()).isEqualTo(listOf(2, 1))
+    }
+
+    @Test
+    fun `when flow has three updates then valueUpdatesOnly sends all`() = runTest {
+        val flow = flowOf(1, 2, 1, 3)
+        assertThat(flow.valueUpdatesOnly().toList()).isEqualTo(listOf(2, 1, 3))
+    }
+}

app/src/test/java/gq/kirmanak/mealient/ui/recipes/RecipeViewModelTest.kt

@@ -0,0 +1,75 @@
+package gq.kirmanak.mealient.ui.recipes
+
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule
+import com.google.common.truth.Truth.assertThat
+import gq.kirmanak.mealient.data.auth.AuthRepo
+import gq.kirmanak.mealient.data.recipes.RecipeRepo
+import gq.kirmanak.mealient.logging.Logger
+import gq.kirmanak.mealient.test.FakeLogger
+import io.mockk.MockKAnnotations
+import io.mockk.every
+import io.mockk.impl.annotations.MockK
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.setMain
+import org.junit.After
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class RecipeViewModelTest {
+
+    @MockK
+    lateinit var authRepo: AuthRepo
+
+    @MockK(relaxed = true)
+    lateinit var recipeRepo: RecipeRepo
+
+    private val logger: Logger = FakeLogger()
+
+    @get:Rule
+    val instantExecutorRule = InstantTaskExecutorRule()
+
+    @Before
+    fun setUp() {
+        MockKAnnotations.init(this)
+        Dispatchers.setMain(UnconfinedTestDispatcher())
+    }
+
+    @After
+    fun tearDown() {
+        Dispatchers.resetMain()
+    }
+
+    @Test
+    fun `when authRepo isAuthorized changes to true expect isAuthorized update`() {
+        every { authRepo.isAuthorizedFlow } returns flowOf(false, true)
+        assertThat(createSubject().isAuthorized.value).isTrue()
+    }
+
+    @Test
+    fun `when authRepo isAuthorized changes to false expect isAuthorized update`() {
+        every { authRepo.isAuthorizedFlow } returns flowOf(true, false)
+        assertThat(createSubject().isAuthorized.value).isFalse()
+    }
+
+    @Test
+    fun `when authRepo isAuthorized doesn't change expect isAuthorized null`() {
+        every { authRepo.isAuthorizedFlow } returns flowOf(true)
+        assertThat(createSubject().isAuthorized.value).isNull()
+    }
+
+    @Test
+    fun `when isAuthorization change is handled expect isAuthorized null`() {
+        every { authRepo.isAuthorizedFlow } returns flowOf(true, false)
+        val subject = createSubject()
+        subject.onAuthorizationChangeHandled()
+        assertThat(subject.isAuthorized.value).isNull()
+    }
+
+    private fun createSubject() = RecipeViewModel(recipeRepo, authRepo, logger)
+}

gradle/libs.versions.toml

@@ -35,6 +35,8 @@ swipeRefreshLayout = "1.1.0"
 splashScreen = "1.0.0"
 # https://developer.android.com/jetpack/androidx/releases/lifecycle
 lifecycle = "2.5.1"
+# https://developer.android.com/jetpack/androidx/releases/arch-core
+coreTesting = "2.1.0"
 # https://github.com/square/retrofit/tags
 retrofit = "2.9.0"
 # https://github.com/JakeWharton/retrofit2-kotlinx-serialization-converter/tags
@@ -121,6 +123,7 @@ androidx-appcompat = { group = "androidx.appcompat", name = "appcompat", version
 androidx-constraintLayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "contraintLayout" }
 androidx-swipeRefreshLayout = { group = "androidx.swiperefreshlayout", name = "swiperefreshlayout", version.ref = "swipeRefreshLayout" }
 androidx-splashScreen = { group = "androidx.core", name = "core-splashscreen", version.ref = "splashScreen" }
+androidx-coreTesting = { group = "androidx.arch.core", name = "core-testing", version.ref = "coreTesting" }
 
 androidx-paging-runtimeKtx = { group = "androidx.paging", name = "paging-runtime-ktx", version.ref = "paging" }
 androidx-paging-commonKtx = { group = "androidx.paging", name = "paging-common-ktx", version.ref = "paging" }