refactor: biometric interactor and enhance UI test coverage

- Convert `BiometricInteractor` from an `expect` class to an interface and provide platform-specific implementations (`AndroidBiometricInteractor`, `IosBiometricInteractor`, etc.).
- Remove `DisableBiometricUseCase` and move its functionality and the biometric disable dialog channel into `BiometricInteractor`.
- Implement `TestBiometricInteractor` and a corresponding Koin module to support mocked biometric states during UI tests.
- Add `BiometricSignInTestCase` and `BiometricSettingsTestCase` to provide reusable test logic for biometric flows.
- Introduce `BiometricEnrollDialog` semantics wrapper and update `SettingsTestScreen` and `SignInScreen` with new biometric test tags.
- Update `SettingsViewModel` and dependency injection modules to reflect the new `BiometricInteractor` structure and the removal of the use case.
- Add Android instrumentation tests (`BiometricSignInTest`, `BiometricSettingsTest`) to verify biometric integration on the platform.

Author: softartdev

app/android/src/androidTest/java/com/softartdev/notedelight/ui/BiometricSettingsTest.kt

@@ -0,0 +1,54 @@
+@file:OptIn(ExperimentalTestApi::class)
+
+package com.softartdev.notedelight.ui
+
+import androidx.compose.ui.test.ComposeUiTest
+import androidx.compose.ui.test.ExperimentalTestApi
+import androidx.test.espresso.Espresso
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.FlakyTest
+import com.softartdev.notedelight.MainActivity
+import com.softartdev.notedelight.di.biometricTestModule
+import com.softartdev.notedelight.interactor.TestBiometricInteractor
+import com.softartdev.notedelight.reflect
+import com.softartdev.notedelight.ui.cases.BiometricSettingsTestCase
+import leakcanary.DetectLeaksAfterTestSuccess
+import leakcanary.TestDescriptionHolder
+import org.junit.After
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.RuleChain
+import org.junit.runner.RunWith
+import org.koin.core.context.loadKoinModules
+import org.koin.mp.KoinPlatformTools
+
+@FlakyTest
+@RunWith(AndroidJUnit4::class)
+class BiometricSettingsTest {
+
+    private val testBiometricInteractor: TestBiometricInteractor
+        get() = KoinPlatformTools.defaultContext().get().get(TestBiometricInteractor::class)
+
+    private val composeTestRule = customAndroidComposeRule<MainActivity>(
+        beforeActivityLaunched = {
+            loadKoinModules(biometricTestModule)
+            testBiometricInteractor.reset(canAuthenticateResult = true)
+        }
+    )
+
+    @get:Rule
+    val rules: RuleChain = RuleChain.outerRule(TestDescriptionHolder)
+        .around(DetectLeaksAfterTestSuccess())
+        .around(composeTestRule)
+
+    private val composeUiTest: ComposeUiTest = reflect(composeTestRule)
+
+    @After
+    fun tearDown() = testBiometricInteractor.reset()
+
+    @Test
+    fun biometricSettingsTest() = BiometricSettingsTestCase(
+        composeUiTest = composeUiTest,
+        closeSoftKeyboard = Espresso::closeSoftKeyboard,
+    ).invoke()
+}

app/android/src/androidTest/java/com/softartdev/notedelight/ui/BiometricSignInTest.kt

@@ -0,0 +1,55 @@
+@file:OptIn(ExperimentalTestApi::class)
+
+package com.softartdev.notedelight.ui
+
+import androidx.compose.ui.test.ComposeUiTest
+import androidx.compose.ui.test.ExperimentalTestApi
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.FlakyTest
+import com.softartdev.notedelight.DbTestEncryptor
+import com.softartdev.notedelight.MainActivity
+import com.softartdev.notedelight.di.biometricTestModule
+import com.softartdev.notedelight.interactor.TestBiometricInteractor
+import com.softartdev.notedelight.reflect
+import com.softartdev.notedelight.ui.cases.BiometricSignInTestCase
+import leakcanary.DetectLeaksAfterTestSuccess
+import leakcanary.TestDescriptionHolder
+import org.junit.After
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.RuleChain
+import org.junit.runner.RunWith
+import org.koin.core.context.loadKoinModules
+import org.koin.mp.KoinPlatformTools
+
+@FlakyTest
+@RunWith(AndroidJUnit4::class)
+class BiometricSignInTest {
+
+    private val testBiometricInteractor: TestBiometricInteractor
+        get() = KoinPlatformTools.defaultContext().get().get(TestBiometricInteractor::class)
+
+    private val composeTestRule = customAndroidComposeRule<MainActivity>(
+        beforeActivityLaunched = {
+            loadKoinModules(biometricTestModule)
+            testBiometricInteractor.reset(
+                canAuthenticateResult = true,
+                storedPassword = DbTestEncryptor.PASSWORD,
+            )
+            DbTestEncryptor()
+        }
+    )
+
+    @get:Rule
+    val rules: RuleChain = RuleChain.outerRule(TestDescriptionHolder)
+        .around(DetectLeaksAfterTestSuccess())
+        .around(composeTestRule)
+
+    private val composeUiTest: ComposeUiTest = reflect(composeTestRule)
+
+    @After
+    fun tearDown() = testBiometricInteractor.reset()
+
+    @Test
+    fun biometricSignInTest() = BiometricSignInTestCase(composeUiTest = composeUiTest).invoke()
+}

core/presentation/src/androidHostTest/kotlin/com/softartdev/notedelight/presentation/adaptive/AdaptiveInteractorTest.kt

@@ -27,7 +27,6 @@ import com.softartdev.notedelight.presentation.settings.SettingsCategoriesAction
 import com.softartdev.notedelight.presentation.settings.SettingsCategoriesViewModel
 import com.softartdev.notedelight.presentation.settings.SettingsViewModel
 import com.softartdev.notedelight.repository.SafeRepo
-import com.softartdev.notedelight.usecase.biometric.DisableBiometricUseCase
 import com.softartdev.notedelight.usecase.crypt.CheckSqlCipherVersionUseCase
 import com.softartdev.notedelight.usecase.note.CreateNoteUseCase
 import com.softartdev.notedelight.usecase.note.DeleteNoteUseCase
@@ -119,7 +118,6 @@ class AdaptiveInteractorTest {
             snackbarInteractor = mockSnackbarInteractor,
             router = mockRouter,
             revealFileListUseCase = revealFileListUseCase,
-            disableBiometricUseCase = DisableBiometricUseCase(mockBiometricInteractor),
             localeInteractor = mockLocaleInteractor,
             adaptiveInteractor = adaptiveInteractor,
             biometricInteractor = mockBiometricInteractor,

core/presentation/src/androidHostTest/kotlin/com/softartdev/notedelight/presentation/settings/SettingsViewModelTest.kt

@@ -16,7 +16,6 @@ import com.softartdev.notedelight.navigation.AppNavGraph
 import com.softartdev.notedelight.navigation.Router
 import com.softartdev.notedelight.presentation.MainDispatcherRule
 import com.softartdev.notedelight.repository.SafeRepo
-import com.softartdev.notedelight.usecase.biometric.DisableBiometricUseCase
 import com.softartdev.notedelight.usecase.crypt.CheckSqlCipherVersionUseCase
 import com.softartdev.notedelight.usecase.settings.AppVersionUseCase
 import com.softartdev.notedelight.usecase.settings.ExportDatabaseUseCase
@@ -61,7 +60,6 @@ class SettingsViewModelTest {
         snackbarInteractor = mockSnackbarInteractor,
         router = mockRouter,
         revealFileListUseCase = RevealFileListUseCase(),
-        disableBiometricUseCase = DisableBiometricUseCase(mockBiometricInteractor),
         localeInteractor = mockLocaleInteractor,
         adaptiveInteractor = adaptiveInteractor,
         biometricInteractor = mockBiometricInteractor,
@@ -184,7 +182,7 @@ class SettingsViewModelTest {
         settingsViewModel.onAction(SettingsAction.ChangeBiometric(false))
         Mockito.verify(mockRouter).navigate(route = AppNavGraph.BiometricDisableConfirmationDialog)
 
-        DisableBiometricUseCase.dialogChannel.send(false)
+        BiometricInteractor.disableDialogChannel.send(false)
         mainDispatcherRule.testDispatcher.scheduler.advanceUntilIdle()
 
         assertTrue(settingsViewModel.stateFlow.value.biometricEnabled)
@@ -203,7 +201,7 @@ class SettingsViewModelTest {
         settingsViewModel.onAction(SettingsAction.ChangeBiometric(false))
         Mockito.verify(mockRouter).navigate(route = AppNavGraph.BiometricDisableConfirmationDialog)
 
-        DisableBiometricUseCase.dialogChannel.send(true)
+        BiometricInteractor.disableDialogChannel.send(true)
         mainDispatcherRule.testDispatcher.scheduler.advanceUntilIdle()
 
         assertFalse(settingsViewModel.stateFlow.value.biometricEnabled)

core/presentation/src/commonMain/kotlin/com/softartdev/notedelight/presentation/settings/SettingsViewModel.kt

@@ -13,7 +13,6 @@ import com.softartdev.notedelight.model.SettingsCategory
 import com.softartdev.notedelight.navigation.AppNavGraph
 import com.softartdev.notedelight.navigation.Router
 import com.softartdev.notedelight.repository.SafeRepo
-import com.softartdev.notedelight.usecase.biometric.DisableBiometricUseCase
 import com.softartdev.notedelight.usecase.crypt.CheckSqlCipherVersionUseCase
 import com.softartdev.notedelight.usecase.settings.AppVersionUseCase
 import com.softartdev.notedelight.usecase.settings.ExportDatabaseUseCase
@@ -37,7 +36,6 @@ class SettingsViewModel(
     private val snackbarInteractor: SnackbarInteractor,
     private val router: Router,
     private val revealFileListUseCase: RevealFileListUseCase,
-    private val disableBiometricUseCase: DisableBiometricUseCase,
     private val localeInteractor: LocaleInteractor,
     private val adaptiveInteractor: AdaptiveInteractor,
     private val biometricInteractor: BiometricInteractor,
@@ -148,11 +146,11 @@ class SettingsViewModel(
             } else {
                 router.navigate(route = AppNavGraph.BiometricDisableConfirmationDialog)
                 val disableBiometric: Boolean = withContext(coroutineDispatchers.io) {
-                    DisableBiometricUseCase.dialogChannel.receive()
+                    BiometricInteractor.disableDialogChannel.receive()
                 }
                 if (disableBiometric) {
                     withContext(coroutineDispatchers.io) {
-                        disableBiometricUseCase()
+                        biometricInteractor.clearStoredPassword()
                     }
                     mutableStateFlow.update { it.copy(biometricEnabled = false) }
                 } else {

core/test/ui/build.gradle.kts

@@ -46,6 +46,7 @@ kotlin {
                 implementation(projects.core.presentation)
                 implementation(projects.core.ui)
                 implementation(projects.feature.backup.ui)
+                api(projects.feature.biometric.domain)
                 implementation(projects.feature.console.presentation)
                 implementation(projects.feature.console.ui)
                 implementation(libs.compose.ui.test)
@@ -95,4 +96,4 @@ kotlin {
     compilerOptions.freeCompilerArgs.add("-Xexpect-actual-classes")
 }
 
-project.disableIosReleaseTasks()
+project.disableIosReleaseTasks()

core/test/ui/src/commonMain/kotlin/com/softartdev/notedelight/di/uiTestModules.kt

@@ -1,6 +1,8 @@
 package com.softartdev.notedelight.di
 
 import com.softartdev.notedelight.UiThreadRouter
+import com.softartdev.notedelight.interactor.BiometricInteractor
+import com.softartdev.notedelight.interactor.TestBiometricInteractor
 import com.softartdev.notedelight.navigation.Router
 import com.softartdev.notedelight.navigation.RouterImpl
 import com.softartdev.notedelight.ui.settings.detail.DatabaseFilePicker
@@ -9,7 +11,7 @@ import org.koin.core.module.Module
 import org.koin.dsl.module
 
 val uiTestModules: List<Module>
-    get() = listOf(navigationTestModule, interactorModule, utilModule, backupTestModule)
+    get() = listOf(navigationTestModule, interactorModule, utilModule, backupTestModule, biometricTestModule)
 
 val navigationTestModule = module {
     single<Router> { UiThreadRouter(router = RouterImpl()) }
@@ -18,3 +20,8 @@ val navigationTestModule = module {
 val backupTestModule = module {
     single<DatabaseFilePicker> { TestDatabaseFilePicker() }
 }
+
+val biometricTestModule = module {
+    single { TestBiometricInteractor() }
+    single<BiometricInteractor> { get<TestBiometricInteractor>() }
+}

core/test/ui/src/commonMain/kotlin/com/softartdev/notedelight/ext.kt

@@ -15,7 +15,7 @@ import co.touchlab.kermit.Logger
 const val ASSERT_WAIT_TIMEOUT_MILLIS: Long = 20_000
 const val MAX_RETRY_ATTEMPTS = 100
 
-inline fun retryUntilDisplayed(
+fun retryUntilDisplayed(
     description: String,
     action: () -> Unit,
     sni: SemanticsNodeInteraction,
@@ -73,4 +73,3 @@ fun ComposeUiTest.waitUntilSelected(
     }
     return@waitUntil true
 }
-

core/test/ui/src/commonMain/kotlin/com/softartdev/notedelight/interactor/TestBiometricInteractor.kt

@@ -0,0 +1,54 @@
+package com.softartdev.notedelight.interactor
+
+class TestBiometricInteractor : BiometricInteractor {
+    var canAuthenticateResult: Boolean = false
+        private set
+    var storedPassword: CharSequence? = null
+        private set
+    var encryptResult: BiometricResult = BiometricResult.Success
+    var decryptResult: DecryptedPasswordResult? = null
+    var clearStoredPasswordCount: Int = 0
+        private set
+
+    fun reset(
+        canAuthenticateResult: Boolean = false,
+        storedPassword: CharSequence? = null,
+    ) {
+        this.canAuthenticateResult = canAuthenticateResult
+        this.storedPassword = storedPassword
+        encryptResult = BiometricResult.Success
+        decryptResult = null
+        clearStoredPasswordCount = 0
+    }
+
+    override suspend fun canAuthenticate(): Boolean = canAuthenticateResult
+
+    override suspend fun hasStoredPassword(): Boolean = storedPassword != null
+
+    override suspend fun encryptAndStorePassword(
+        password: CharSequence,
+        title: String,
+        subtitle: String,
+        negativeButton: String,
+        biometricPlatformWrapper: BiometricPlatformWrapper,
+    ): BiometricResult {
+        if (encryptResult == BiometricResult.Success) {
+            storedPassword = password.toString()
+        }
+        return encryptResult
+    }
+
+    override suspend fun decryptStoredPassword(
+        title: String,
+        subtitle: String,
+        negativeButton: String,
+        biometricPlatformWrapper: BiometricPlatformWrapper,
+    ): DecryptedPasswordResult = decryptResult
+        ?: storedPassword?.let { DecryptedPasswordResult.Success(it) }
+        ?: DecryptedPasswordResult.Unavailable
+
+    override suspend fun clearStoredPassword() {
+        clearStoredPasswordCount++
+        storedPassword = null
+    }
+}

core/test/ui/src/commonMain/kotlin/com/softartdev/notedelight/ui/BaseTestCase.kt

@@ -9,6 +9,7 @@ import com.softartdev.notedelight.ui.screen.NoteScreen
 import com.softartdev.notedelight.ui.screen.SettingsTestScreen
 import com.softartdev.notedelight.ui.screen.SignInScreen
 import com.softartdev.notedelight.ui.screen.dialog.BiometricDisableConfirmationDialog
+import com.softartdev.notedelight.ui.screen.dialog.BiometricEnrollDialog
 import com.softartdev.notedelight.ui.screen.dialog.ChangePasswordDialog
 import com.softartdev.notedelight.ui.screen.dialog.CommonDialog
 import com.softartdev.notedelight.ui.screen.dialog.CommonDialogImpl
@@ -56,6 +57,9 @@ abstract class BaseTestCase(val composeUiTest: ComposeUiTest) {
         block: suspend BiometricDisableConfirmationDialog.() -> Unit,
     ) = BiometricDisableConfirmationDialog(commonDialog).block()
 
+    suspend inline fun biometricEnrollDialog(block: suspend BiometricEnrollDialog.() -> Unit) =
+        BiometricEnrollDialog(commonDialog).block()
+
     suspend inline fun languageDialog(block: suspend LanguageDialog.() -> Unit) =
         LanguageDialog(commonDialog).block()
 }