Add tests

app/src/androidTest/java/com/google/samples/apps/nowinandroid/ui/NavigationTest.kt

@@ -75,6 +75,8 @@ class NavigationTest {
     private lateinit var appName: String
     private lateinit var saved: String
     private lateinit var settings: String
+    private lateinit var brand: String
+    private lateinit var ok: String
 
     @Before
     fun setup() {
@@ -88,6 +90,8 @@ class NavigationTest {
             appName = getString(R.string.app_name)
             saved = getString(BookmarksR.string.saved)
             settings = getString(SettingsR.string.top_app_bar_action_icon_description)
+            brand = getString(SettingsR.string.brand_android)
+            ok = getString(SettingsR.string.dismiss_dialog_button_text)
         }
     }
 
@@ -189,6 +193,31 @@ class NavigationTest {
         }
     }
 
+    @Test
+    fun whenSettingsIconIsClicked_settingsDialogIsShown() {
+        composeTestRule.apply {
+            onNodeWithContentDescription(settings).performClick()
+
+            // Check that one of the settings is actually displayed.
+            onNodeWithText(brand).assertExists()
+        }
+    }
+
+    @Test
+    fun whenSettingsDialogDismissed_previousScreenIsDisplayed(){
+
+        composeTestRule.apply {
+
+            // Navigate to the saved screen, open the settings dialog, then close it.
+            onNodeWithText(saved).performClick()
+            onNodeWithContentDescription(settings).performClick()
+            onNodeWithText(ok).performClick()
+
+            // Check that the saved screen is still visible and selected.
+            onNodeWithText(saved).assertIsSelected()
+        }
+    }
+
     /*
      * There should always be at most one instance of a top-level destination at the same time.
      */

feature/settings/src/androidTest/java/com/google/samples/apps/nowinandroid/feature/settings/SettingsDialogTest.kt

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.feature.settings
+
+import androidx.activity.ComponentActivity
+import androidx.compose.ui.test.assertIsSelected
+import androidx.compose.ui.test.junit4.createAndroidComposeRule
+import androidx.compose.ui.test.onNodeWithText
+import com.google.samples.apps.nowinandroid.core.model.data.DarkThemeConfig.DARK
+import com.google.samples.apps.nowinandroid.core.model.data.ThemeBrand.ANDROID
+import com.google.samples.apps.nowinandroid.feature.settings.SettingsUiState.Loading
+import com.google.samples.apps.nowinandroid.feature.settings.SettingsUiState.Success
+import org.junit.Rule
+import org.junit.Test
+
+class SettingsDialogTest {
+
+    @get:Rule
+    val composeTestRule = createAndroidComposeRule<ComponentActivity>()
+
+    private fun getString(id: Int) = composeTestRule.activity.resources.getString(id)
+
+    @Test
+    fun whenLoading_showsLoadingText() {
+
+        composeTestRule.setContent {
+            SettingsDialog(
+                settingsUiState = Loading,
+                onDismiss = {  },
+                onChangeThemeBrand = {},
+                onChangeDarkThemeConfig = {}
+            )
+        }
+
+        composeTestRule
+            .onNodeWithText(getString(R.string.loading))
+            .assertExists()
+    }
+
+    @Test
+    fun whenStateIsSuccess_allSettingsAreDisplayed(){
+        composeTestRule.setContent {
+            SettingsDialog(
+                settingsUiState = Success(
+                    UserEditableSettings(
+                        brand = ANDROID,
+                        darkThemeConfig = DARK
+                    )
+                ),
+                onDismiss = {  },
+                onChangeThemeBrand = {},
+                onChangeDarkThemeConfig = {}
+            )
+        }
+
+        // Check that all the possible settings are displayed.
+        composeTestRule.onNodeWithText(getString(R.string.brand_default)).assertExists()
+        composeTestRule.onNodeWithText(getString(R.string.brand_android)).assertExists()
+        composeTestRule.onNodeWithText(
+            getString(R.string.dark_mode_config_system_default)
+        ).assertExists()
+        composeTestRule.onNodeWithText(getString(R.string.dark_mode_config_light)).assertExists()
+        composeTestRule.onNodeWithText(getString(R.string.dark_mode_config_dark)).assertExists()
+
+        // Check that the correct settings are selected.
+        composeTestRule.onNodeWithText(getString(R.string.brand_android)).assertIsSelected()
+        composeTestRule.onNodeWithText(getString(R.string.dark_mode_config_dark)).assertIsSelected()
+    }
+}

feature/settings/src/main/java/com/google/samples/apps/nowinandroid/feature/settings/SettingsDialog.kt

@@ -25,8 +25,10 @@ import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.selection.selectable
 import androidx.compose.foundation.selection.selectableGroup
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.Divider
 import androidx.compose.material3.MaterialTheme
@@ -53,6 +55,7 @@ import com.google.samples.apps.nowinandroid.core.model.data.DarkThemeConfig.LIGH
 import com.google.samples.apps.nowinandroid.core.model.data.ThemeBrand
 import com.google.samples.apps.nowinandroid.core.model.data.ThemeBrand.ANDROID
 import com.google.samples.apps.nowinandroid.core.model.data.ThemeBrand.DEFAULT
+import com.google.samples.apps.nowinandroid.feature.settings.R.string
 import com.google.samples.apps.nowinandroid.feature.settings.SettingsUiState.Loading
 import com.google.samples.apps.nowinandroid.feature.settings.SettingsUiState.Success
 
@@ -73,8 +76,8 @@ internal fun SettingsDialog(
 
 @Composable
 fun SettingsDialog(
-    onDismiss: () -> Unit,
     settingsUiState: SettingsUiState,
+    onDismiss: () -> Unit,
     onChangeThemeBrand: (themeBrand: ThemeBrand) -> Unit,
     onChangeDarkThemeConfig: (darkThemeConfig: DarkThemeConfig) -> Unit
 ) {
@@ -88,8 +91,8 @@ fun SettingsDialog(
             )
         },
         text = {
-            Column {
-                Divider()
+            Divider()
+            Column (Modifier.verticalScroll(rememberScrollState())) {
                 when (settingsUiState) {
                     Loading -> {
                         Text(
@@ -111,7 +114,7 @@ fun SettingsDialog(
         },
         confirmButton = {
             Text(
-                text = "OK",
+                text = stringResource(string.dismiss_dialog_button_text),
                 style = MaterialTheme.typography.labelLarge,
                 color = MaterialTheme.colorScheme.primary,
                 modifier = Modifier
@@ -182,7 +185,7 @@ fun SettingsDialogThemeChooserRow(
             .selectable(
                 selected = selected,
                 role = Role.RadioButton,
-                onClick = onClick
+                onClick = onClick,
             )
             .padding(8.dp),
         verticalAlignment = Alignment.CenterVertically

feature/settings/src/main/java/com/google/samples/apps/nowinandroid/feature/settings/SettingsViewModel.kt

@@ -73,5 +73,5 @@ data class UserEditableSettings(val brand: ThemeBrand, val darkThemeConfig: Dark
 
 sealed interface SettingsUiState {
     object Loading : SettingsUiState
-    class Success(val settings: UserEditableSettings) : SettingsUiState
+    data class Success(val settings: UserEditableSettings) : SettingsUiState
 }

feature/settings/src/main/res/values/strings.xml

@@ -26,4 +26,5 @@
     <string name="dark_mode_config_system_default">System default</string>
     <string name="dark_mode_config_light">Light</string>
     <string name="dark_mode_config_dark">Dark</string>
+    <string name="dismiss_dialog_button_text">OK</string>
 </resources>

feature/settings/src/test/java/com/google/samples/apps/nowinandroid/feature/settings/SettingsViewModelTest.kt

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.feature.settings
+
+import com.google.samples.apps.nowinandroid.core.model.data.DarkThemeConfig.DARK
+import com.google.samples.apps.nowinandroid.core.model.data.ThemeBrand.ANDROID
+import com.google.samples.apps.nowinandroid.core.testing.repository.TestUserDataRepository
+import com.google.samples.apps.nowinandroid.core.testing.util.MainDispatcherRule
+import com.google.samples.apps.nowinandroid.feature.settings.SettingsUiState.Loading
+import com.google.samples.apps.nowinandroid.feature.settings.SettingsUiState.Success
+import junit.framework.Assert.assertEquals
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.runTest
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+
+class SettingsViewModelTest {
+
+    @get:Rule
+    val mainDispatcherRule = MainDispatcherRule()
+
+    private val userDataRepository = TestUserDataRepository()
+
+    private lateinit var viewModel: SettingsViewModel
+
+    @Before
+    fun setup() {
+        viewModel = SettingsViewModel(userDataRepository)
+    }
+
+    @Test
+    fun stateIsInitiallyLoading() = runTest {
+       assertEquals(Loading, viewModel.settingsUiState.value)
+    }
+
+    @Test
+    fun stateIsSuccessAfterUserDataLoaded() = runTest {
+
+        val collectJob =
+            launch(UnconfinedTestDispatcher()) { viewModel.settingsUiState.collect() }
+
+        userDataRepository.setThemeBrand(ANDROID)
+        userDataRepository.setDarkThemeConfig(DARK)
+
+        assertEquals(
+            Success(
+                UserEditableSettings(
+                    brand = ANDROID,
+                    darkThemeConfig = DARK
+                )
+            ),
+            viewModel.settingsUiState.value)
+
+        collectJob.cancel()
+    }
+}