add android unit tests

mobile/android/app/build.gradle

@@ -1,106 +1,122 @@
 plugins {
-    id "com.android.application"
+  id "com.android.application"
-    id "kotlin-android"
+  id "kotlin-android"
-    id "dev.flutter.flutter-gradle-plugin"
+  id "dev.flutter.flutter-gradle-plugin"
-    id 'com.google.devtools.ksp'
+  id 'com.google.devtools.ksp'
-    id 'org.jetbrains.kotlin.plugin.serialization'
+  id 'org.jetbrains.kotlin.plugin.serialization'
 }
 
 def localProperties = new Properties()
 def localPropertiesFile = rootProject.file('local.properties')
 if (localPropertiesFile.exists()) {
-    localPropertiesFile.withInputStream { localProperties.load(it) }
+  localPropertiesFile.withInputStream { localProperties.load(it) }
 }
 
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
 if (flutterVersionCode == null) {
-    flutterVersionCode = '1'
+  flutterVersionCode = '1'
 }
 
 def flutterVersionName = localProperties.getProperty('flutter.versionName')
 if (flutterVersionName == null) {
-    flutterVersionName = '1.0'
+  flutterVersionName = '1.0'
 }
 
 def keystoreProperties = new Properties()
 def keystorePropertiesFile = rootProject.file('key.properties')
 if (keystorePropertiesFile.exists()) {
-    keystorePropertiesFile.withInputStream { keystoreProperties.load(it) }
+  keystorePropertiesFile.withInputStream { keystoreProperties.load(it) }
 }
 
 android {
-    compileSdkVersion 35
+  compileSdkVersion 35
 
-    compileOptions {
+  compileOptions {
-        sourceCompatibility JavaVersion.VERSION_17
+    sourceCompatibility JavaVersion.VERSION_17
-        targetCompatibility JavaVersion.VERSION_17
+    targetCompatibility JavaVersion.VERSION_17
-        coreLibraryDesugaringEnabled true
+    coreLibraryDesugaringEnabled true
+  }
+
+  kotlinOptions {
+    jvmTarget = '17'
+  }
+
+  sourceSets {
+    main.java.srcDirs += 'src/main/kotlin'
+  }
+
+  defaultConfig {
+    applicationId "app.alextran.immich"
+    minSdkVersion 26
+    targetSdkVersion 35
+    versionCode flutterVersionCode.toInteger()
+    versionName flutterVersionName
+  }
+
+  signingConfigs {
+    release {
+      def keyAliasVal = System.getenv("ALIAS")
+      def keyPasswordVal = System.getenv("ANDROID_KEY_PASSWORD")
+      def storePasswordVal = System.getenv("ANDROID_STORE_PASSWORD")
+
+      keyAlias keyAliasVal ? keyAliasVal : keystoreProperties['keyAlias']
+      keyPassword keyPasswordVal ? keyPasswordVal : keystoreProperties['keyPassword']
+      storeFile file("../key.jks") ? file("../key.jks") : file(keystoreProperties['storeFile'])
+      storePassword storePasswordVal ? storePasswordVal : keystoreProperties['storePassword']
+    }
+  }
+
+  buildTypes {
+    debug {
+      applicationIdSuffix '.debug'
+      versionNameSuffix '-DEBUG'
     }
 
-    kotlinOptions {
+    release {
-        jvmTarget = '17'
+      signingConfig signingConfigs.release
     }
+  }
 
-    sourceSets {
+  namespace 'app.alextran.immich'
-        main.java.srcDirs += 'src/main/kotlin'
+
+  testOptions {
+    unitTests.returnDefaultValues = true
+    unitTests.all {
+      testLogging {
+        events "passed", "skipped", "failed", "standardOut", "standardError"
+        outputs.upToDateWhen { false }
+        showStandardStreams = true
+      }
     }
-
+  }
-    defaultConfig {
-        applicationId "app.alextran.immich"
-        minSdkVersion 26
-        targetSdkVersion 35
-        versionCode flutterVersionCode.toInteger()
-        versionName flutterVersionName
-    }
-
-   signingConfigs {
-       release {
-            def keyAliasVal = System.getenv("ALIAS")
-            def keyPasswordVal = System.getenv("ANDROID_KEY_PASSWORD")
-            def storePasswordVal = System.getenv("ANDROID_STORE_PASSWORD")
-
-            keyAlias keyAliasVal ? keyAliasVal : keystoreProperties['keyAlias']
-            keyPassword keyPasswordVal ? keyPasswordVal : keystoreProperties['keyPassword']
-            storeFile file("../key.jks") ? file("../key.jks") : file(keystoreProperties['storeFile'])
-            storePassword storePasswordVal ? storePasswordVal : keystoreProperties['storePassword']
-       }
-   }
-
-    buildTypes {
-        debug {
-            applicationIdSuffix '.debug'
-            versionNameSuffix '-DEBUG'
-        }
-
-        release {
-            signingConfig signingConfigs.release
-        }
-    }
-    namespace 'app.alextran.immich'
 }
 
 flutter {
-    source '../..'
+  source '../..'
 }
 
 dependencies {
-    def kotlin_version = '2.0.20'
+  def kotlin_version = '2.0.20'
-    def kotlin_coroutines_version = '1.9.0'
+  def kotlin_coroutines_version = '1.9.0'
-    def work_version = '2.9.1'
+  def work_version = '2.9.1'
-    def concurrent_version = '1.2.0'
+  def concurrent_version = '1.2.0'
-    def guava_version = '33.3.1-android'
+  def guava_version = '33.3.1-android'
-    def glide_version = '4.16.0'
+  def glide_version = '4.16.0'
-    def serialization_version = '1.8.1'
+  def serialization_version = '1.8.1'
 
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+  implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
-    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$kotlin_coroutines_version"
+  implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$kotlin_coroutines_version"
-    implementation "androidx.work:work-runtime-ktx:$work_version"
+  implementation "androidx.work:work-runtime-ktx:$work_version"
-    implementation "androidx.concurrent:concurrent-futures:$concurrent_version"
+  implementation "androidx.concurrent:concurrent-futures:$concurrent_version"
-    implementation "com.google.guava:guava:$guava_version"
+  implementation "com.google.guava:guava:$guava_version"
-    implementation "com.github.bumptech.glide:glide:$glide_version"
+  implementation "com.github.bumptech.glide:glide:$glide_version"
-    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:$serialization_version"
+  implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:$serialization_version"
-    ksp "com.github.bumptech.glide:ksp:$glide_version"
+
-    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.1.2'
+  testImplementation "junit:junit:4.13.2"
+  testImplementation "io.mockk:mockk:1.13.10"
+
+  ksp "com.github.bumptech.glide:ksp:$glide_version"
+  coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.1.2'
 }
 
 // This is uncommented in F-Droid build script

mobile/android/app/src/main/kotlin/app/alextran/immich/platform/MediaManager.kt

@@ -14,9 +14,9 @@ class MediaManager(context: Context) {
   private val ctx: Context = context.applicationContext
 
   companion object {
-    private const val SHARED_PREF_NAME = "Immich::MediaManager"
+    const val SHARED_PREF_NAME = "Immich::MediaManager"
-    private const val SHARED_PREF_MEDIA_STORE_VERSION_KEY = "MediaStore::getVersion"
+    const val SHARED_PREF_MEDIA_STORE_VERSION_KEY = "MediaStore::getVersion"
-    private const val SHARED_PREF_MEDIA_STORE_GEN_KEY = "MediaStore::getGeneration"
+    const val SHARED_PREF_MEDIA_STORE_GEN_KEY = "MediaStore::getGeneration"
 
     private fun getSavedGenerationMap(context: Context): Map<String, Long> {
       return context.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE)

mobile/android/app/src/test/kotlin/app/alextran/immich/platform/MediaManagerTest.kt

@@ -0,0 +1,512 @@
+package app.alextran.immich.platform
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.database.Cursor
+import android.net.Uri
+import android.provider.MediaStore
+import app.alextran.immich.platform.MediaManager.Companion.SHARED_PREF_MEDIA_STORE_GEN_KEY
+import app.alextran.immich.platform.MediaManager.Companion.SHARED_PREF_MEDIA_STORE_VERSION_KEY
+import app.alextran.immich.platform.MediaManager.Companion.SHARED_PREF_NAME
+import io.mockk.Called
+import io.mockk.CapturingSlot
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkStatic
+import io.mockk.slot
+import io.mockk.unmockkAll
+import io.mockk.verify
+import kotlinx.serialization.json.Json
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.TemporaryFolder
+
+
+class MediaManagerTest {
+
+  private lateinit var mediaManager: MediaManager
+  private lateinit var mockContext: Context
+  private lateinit var mockPrefs: SharedPreferences
+  private lateinit var mockEditor: SharedPreferences.Editor
+  private lateinit var mockExternalUri: Uri
+  private lateinit var mockContentResolver: android.content.ContentResolver
+
+  @JvmField
+  @Rule
+  val tempFolder: TemporaryFolder = TemporaryFolder()
+
+  @Before
+  fun setUp() {
+    mockContext = mockk(relaxed = true)
+    mockContentResolver = mockk<android.content.ContentResolver>(relaxed = true)
+    every { mockContext.applicationContext } returns mockContext
+    every { mockContext.contentResolver } returns mockContentResolver
+
+    mediaManager = MediaManager(mockContext)
+
+    mockPrefs = mockk(relaxed = true)
+    mockEditor = mockk(relaxed = true)
+
+    every {
+      mockContext.getSharedPreferences(
+        SHARED_PREF_NAME,
+        Context.MODE_PRIVATE
+      )
+    } returns mockPrefs
+    every { mockPrefs.edit() } returns mockEditor
+    every { mockEditor.putString(any(), any()) } returns mockEditor
+    every { mockEditor.remove(any()) } returns mockEditor
+    every { mockEditor.apply() } answers { }
+
+    mockkStatic(Uri::class)
+    mockExternalUri = mockk<Uri>()
+    every { Uri.parse(any()) } returns mockExternalUri
+
+    mockkStatic(MediaStore::class)
+    mockkStatic(MediaStore.Files::class)
+  }
+
+  @After
+  fun tearDown() {
+    unmockkAll()
+  }
+
+  @Test
+  fun `clearSyncCheckpoint removes keys from shared preferences`() {
+    mediaManager.clearSyncCheckpoint()
+
+    verify { mockEditor.remove(SHARED_PREF_MEDIA_STORE_VERSION_KEY) }
+    verify { mockEditor.remove(SHARED_PREF_MEDIA_STORE_GEN_KEY) }
+    verify { mockEditor.apply() }
+  }
+
+  @Test
+  fun `shouldFullSync returns true when MediaStore version differs`() {
+    every { MediaStore.getVersion(mockContext) } returns "v2"
+    every { mockPrefs.getString(SHARED_PREF_MEDIA_STORE_VERSION_KEY, null) } returns "v1"
+
+    assertTrue(mediaManager.shouldFullSync())
+  }
+
+  @Test
+  fun `shouldFullSync returns true when no version`() {
+    every { MediaStore.getVersion(mockContext) } returns "v1"
+    every { mockPrefs.getString(SHARED_PREF_MEDIA_STORE_VERSION_KEY, null) } returns null
+
+    assertTrue(mediaManager.shouldFullSync())
+  }
+
+  @Test
+  fun `shouldFullSync returns false when MediaStore version is same`() {
+    val currentVersion = "v2"
+    every { MediaStore.getVersion(mockContext) } returns currentVersion
+    every { mockPrefs.getString(SHARED_PREF_MEDIA_STORE_VERSION_KEY, null) } returns currentVersion
+
+    assertFalse(mediaManager.shouldFullSync())
+  }
+
+  @Test
+  fun `getAssetIdsForAlbum queries content resolver and returns IDs`() {
+    val albumId = "recent_id"
+
+    val mockCursor = mockk<Cursor>()
+    every { mockCursor.moveToNext() } returnsMany listOf(true, true, false)
+    every { mockCursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns._ID) } returns 0
+    every { mockCursor.getLong(0) } returnsMany listOf(123L, 456L)
+    every { mockCursor.close() } answers { }
+
+    every { MediaStore.Files.getContentUri(MediaStore.VOLUME_EXTERNAL) } returns mockExternalUri
+    every {
+      mockContentResolver.query(
+        eq(mockExternalUri),
+        any(),
+        eq("${MediaStore.Files.FileColumns.BUCKET_ID} = ? AND (${MediaStore.Files.FileColumns.MEDIA_TYPE} = ? OR ${MediaStore.Files.FileColumns.MEDIA_TYPE} = ?)"),
+        eq(
+          arrayOf(
+            albumId,
+            MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE.toString(),
+            MediaStore.Files.FileColumns.MEDIA_TYPE_VIDEO.toString()
+          )
+        ),
+        null
+      )
+    } returns mockCursor
+
+    val assetIds = mediaManager.getAssetIdsForAlbum(albumId)
+
+    assertEquals(listOf("123", "456"), assetIds)
+    verify { mockCursor.close() }
+  }
+
+  @Test
+  fun `checkpointSync stores current MediaStore version and generation`() {
+    val testVersion = "v1"
+    val volumeName = "external_primary"
+    val generation = 12345L
+
+    every { MediaStore.getVersion(mockContext) } returns testVersion
+    every { MediaStore.getExternalVolumeNames(mockContext) } returns setOf(volumeName)
+    every { MediaStore.getGeneration(mockContext, volumeName) } returns generation
+
+    mediaManager.checkpointSync()
+
+    verify { mockEditor.putString(SHARED_PREF_MEDIA_STORE_VERSION_KEY, testVersion) }
+    val expectedGenMapJson = Json.encodeToString(mapOf(volumeName to generation))
+    verify { mockEditor.putString(eq(SHARED_PREF_MEDIA_STORE_GEN_KEY), expectedGenMapJson) }
+    verify { mockEditor.apply() }
+  }
+
+  @Test
+  fun `getMediaChanges returns no changes when generations and volumes are same`() {
+    val volumeName = "external_primary"
+    val generation = 100L
+    val genMap = mapOf(volumeName to generation)
+    every {
+      mockPrefs.getString(
+        SHARED_PREF_MEDIA_STORE_GEN_KEY,
+        null
+      )
+    } returns Json.encodeToString(genMap)
+    every { MediaStore.getExternalVolumeNames(mockContext) } returns setOf(volumeName)
+    every { MediaStore.getGeneration(mockContext, volumeName) } returns generation
+
+    val result = mediaManager.getMediaChanges()
+
+    assertFalse(result.hasChanges)
+    assertTrue(result.updates.isEmpty())
+    assertTrue(result.deletes.isEmpty())
+    verify { mockContentResolver wasNot Called }
+  }
+
+  @Test
+  fun `getMediaChanges detects new assets when generation increases`() {
+    val volumeName = "external_primary"
+    val oldGeneration = 100L
+    val newGeneration = 101L
+    val genMap = mapOf(volumeName to oldGeneration)
+
+    val tempFile = tempFolder.newFile("image.jpg")
+
+    every {
+      mockPrefs.getString(SHARED_PREF_MEDIA_STORE_GEN_KEY, null)
+    } returns Json.encodeToString(genMap)
+    every { MediaStore.getExternalVolumeNames(mockContext) } returns setOf(volumeName)
+    every { MediaStore.getGeneration(mockContext, volumeName) } returns newGeneration
+    every { MediaStore.Files.getContentUri(volumeName) } returns mockExternalUri
+
+    val assetProperties = MockAssetProperties(
+      id = 1L,
+      path = tempFile.absolutePath,
+      displayName = "image.jpg",
+      dateTaken = 1678886400000L,
+      dateAdded = 1678886400L,
+      dateModified = 1678886500L,
+      mediaType = MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE,
+      bucketId = "bucket1",
+      duration = 0L
+    )
+    val mockCursor = mockCursorForMediaItems(listOf(assetProperties))
+    val selectionSlot = slot<String>()
+    val selectionArgsSlot = slot<Array<String>>()
+    mockContentResolverQuery(mockExternalUri, mockCursor, selectionSlot, selectionArgsSlot)
+
+    val result = mediaManager.getMediaChanges()
+
+    assertTrue(result.hasChanges)
+    assertEquals(1, result.updates.size)
+    assertEquals("1", result.updates[0].id)
+    assertEquals("image.jpg", result.updates[0].name)
+    assertEquals(1678886400L, result.updates[0].createdAt)
+    assertEquals(1678886500000L, result.updates[0].updatedAt)
+    assertTrue(result.deletes.isEmpty())
+
+    assertEquals(
+      "(${MediaStore.Files.FileColumns.MEDIA_TYPE} = ? OR ${MediaStore.Files.FileColumns.MEDIA_TYPE} = ?) AND (${MediaStore.MediaColumns.GENERATION_MODIFIED} > ? OR ${MediaStore.MediaColumns.GENERATION_ADDED} > ?)",
+      selectionSlot.captured
+    )
+    assertEquals(oldGeneration.toString(), selectionArgsSlot.captured[2])
+    assertEquals(oldGeneration.toString(), selectionArgsSlot.captured[3])
+
+    verify { mockCursor.close() }
+  }
+
+  @Test
+  fun `getMediaChanges detects deleted assets when file path does not exist`() {
+    val volumeName = "external_primary"
+    val oldGeneration = 100L
+    val newGeneration = 101L
+    val genMap = mapOf(volumeName to oldGeneration)
+
+    every {
+      mockPrefs.getString(SHARED_PREF_MEDIA_STORE_GEN_KEY, null)
+    } returns Json.encodeToString(genMap)
+    every { MediaStore.getExternalVolumeNames(mockContext) } returns setOf(volumeName)
+    every { MediaStore.getGeneration(mockContext, volumeName) } returns newGeneration
+    every { MediaStore.Files.getContentUri(volumeName) } returns mockExternalUri
+
+    val assetProperties = MockAssetProperties(
+      id = 2L,
+      path = "/path/to/deleted_image.jpg",
+      displayName = "deleted_image.jpg",
+      dateTaken = 0L, dateAdded = 0L, dateModified = 0L,
+      mediaType = MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE,
+      bucketId = "bucket_deleted",
+      duration = 0L
+    )
+    val mockCursor = mockCursorForMediaItems(listOf(assetProperties))
+    mockContentResolverQuery(mockExternalUri, mockCursor)
+
+    val result = mediaManager.getMediaChanges()
+
+    assertTrue(result.hasChanges)
+    assertTrue(result.updates.isEmpty())
+    assertEquals(1, result.deletes.size)
+    assertEquals("2", result.deletes[0])
+    verify { mockCursor.close() }
+  }
+
+  @Test
+  fun `getMediaChanges handles multiple volumes with additions and deletions`() {
+    val volume1Name = "external_primary"
+    val volume2Name = "sd_card"
+    val initialGenVolume1 = 100L
+    val initialGenVolume2 = 50L
+    val newGenVolume1 = 101L
+    val newGenVolume2 = 51L
+
+    val initialGenMap = mapOf(volume1Name to initialGenVolume1, volume2Name to initialGenVolume2)
+    every {
+      mockPrefs.getString(SHARED_PREF_MEDIA_STORE_GEN_KEY, null)
+    } returns Json.encodeToString(initialGenMap)
+
+    every { MediaStore.getExternalVolumeNames(mockContext) } returns setOf(volume1Name, volume2Name)
+    every { MediaStore.getGeneration(mockContext, volume1Name) } returns newGenVolume1
+    every { MediaStore.getGeneration(mockContext, volume2Name) } returns newGenVolume2
+
+    val mockUriVolume1 = mockk<Uri>()
+    val mockUriVolume2 = mockk<Uri>()
+    every { MediaStore.Files.getContentUri(volume1Name) } returns mockUriVolume1
+    every { MediaStore.Files.getContentUri(volume2Name) } returns mockUriVolume2
+
+    val tempFile1 = tempFolder.newFile("image_vol1.jpg")
+    val assetVol1 = MockAssetProperties(
+      id = 10L,
+      path = tempFile1.absolutePath,
+      displayName = "image_vol1.jpg",
+      dateTaken = 1678886400000L,
+      dateAdded = 1678886400L,
+      dateModified = 1678886500L,
+      mediaType = MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE,
+      bucketId = "bucket_vol1",
+      duration = 0L
+    )
+    val mockCursorVol1 = mockCursorForMediaItems(listOf(assetVol1))
+    val selectionArgsSlotVol1 = slot<Array<String>>()
+    mockContentResolverQuery(
+      mockUriVolume1,
+      mockCursorVol1,
+      selectionArgsSlot = selectionArgsSlotVol1
+    )
+
+    val assetVol2Deleted = MockAssetProperties(
+      id = 20L,
+      path = "/path/to/deleted_vol2.jpg",
+      displayName = "deleted_vol2.jpg",
+      dateTaken = 0L,
+      dateAdded = 0L,
+      dateModified = 0L,
+      mediaType = MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE,
+      bucketId = "bucket_vol2_del",
+      duration = 0L
+    )
+    val mockCursorVol2 = mockCursorForMediaItems(listOf(assetVol2Deleted))
+    val selectionArgsSlotVol2 = slot<Array<String>>()
+    mockContentResolverQuery(
+      mockUriVolume2,
+      mockCursorVol2,
+      selectionArgsSlot = selectionArgsSlotVol2
+    )
+
+    val result = mediaManager.getMediaChanges()
+
+    assertTrue(result.hasChanges)
+    assertEquals(1, result.updates.size)
+    assertEquals("10", result.updates[0].id)
+    assertEquals("image_vol1.jpg", result.updates[0].name)
+
+    assertEquals(1, result.deletes.size)
+    assertEquals("20", result.deletes[0])
+
+    assertEquals(initialGenVolume1.toString(), selectionArgsSlotVol1.captured[2])
+    assertEquals(initialGenVolume1.toString(), selectionArgsSlotVol1.captured[3])
+    assertEquals(initialGenVolume2.toString(), selectionArgsSlotVol2.captured[2])
+    assertEquals(initialGenVolume2.toString(), selectionArgsSlotVol2.captured[3])
+
+    verify { mockCursorVol1.close() }
+    verify { mockCursorVol2.close() }
+  }
+
+  @Test
+  fun `getMediaChanges detects new volume`() {
+    val volume1Name = "external_primary"
+    val initialGenVolume1 = 100L
+    val initialGenMap = mapOf(volume1Name to initialGenVolume1)
+
+    val volume2Name = "new_sd_card"
+    val newGenVolume1 = 100L
+    val newGenVolume2 = 5L
+
+    every {
+      mockPrefs.getString(SHARED_PREF_MEDIA_STORE_GEN_KEY, null)
+    } returns Json.encodeToString(initialGenMap)
+
+    every { MediaStore.getExternalVolumeNames(mockContext) } returns setOf(volume1Name, volume2Name)
+    every { MediaStore.getGeneration(mockContext, volume1Name) } returns newGenVolume1
+    every { MediaStore.getGeneration(mockContext, volume2Name) } returns newGenVolume2
+
+    val mockUriVolume2 = mockk<Uri>()
+    every { MediaStore.Files.getContentUri(volume2Name) } returns mockUriVolume2
+
+    val tempFile2 = tempFolder.newFile("image_vol2.jpg")
+    val assetVol2 = MockAssetProperties(
+      id = 30L,
+      path = tempFile2.absolutePath,
+      displayName = "image_vol2.jpg",
+      dateTaken = 0L,
+      dateAdded = 1678886600L,
+      dateModified = 1678886700L,
+      mediaType = MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE,
+      bucketId = "bucket_vol2",
+      duration = 0L
+    )
+    val mockCursorVol2 = mockCursorForMediaItems(listOf(assetVol2))
+    val selectionArgsSlotVol2 = slot<Array<String>>()
+    mockContentResolverQuery(
+      mockUriVolume2,
+      mockCursorVol2,
+      selectionArgsSlot = selectionArgsSlotVol2
+    )
+
+    val result = mediaManager.getMediaChanges()
+
+    assertTrue(result.hasChanges)
+    assertEquals(1, result.updates.size)
+    assertEquals("30", result.updates[0].id)
+    assertEquals(1678886600L, result.updates[0].createdAt)
+    assertTrue(result.deletes.isEmpty())
+
+    assertEquals(
+      "0",
+      selectionArgsSlotVol2.captured[2]
+    )
+    assertEquals("0", selectionArgsSlotVol2.captured[3])
+
+    verify(exactly = 0) {
+      mockContentResolver.query(
+        eq(MediaStore.Files.getContentUri(volume1Name)),
+        any(),
+        any(),
+        any(),
+        null
+      )
+    }
+    verify { mockCursorVol2.close() }
+  }
+
+  @Test
+  fun `getMediaChanges handles removed volume`() {
+    val volume1Name = "external_primary"
+    val volume2Name = "sd_card_to_be_removed"
+    val initialGenVolume1 = 100L
+    val initialGenVolume2 = 50L
+
+    val initialGenMap = mapOf(volume1Name to initialGenVolume1, volume2Name to initialGenVolume2)
+    every {
+      mockPrefs.getString(
+        SHARED_PREF_MEDIA_STORE_GEN_KEY,
+        null
+      )
+    } returns Json.encodeToString(initialGenMap)
+
+    every { MediaStore.getExternalVolumeNames(mockContext) } returns setOf(volume1Name)
+    every { MediaStore.getGeneration(mockContext, volume1Name) } returns initialGenVolume1
+
+    val result = mediaManager.getMediaChanges()
+
+    assertTrue(result.hasChanges)
+    // No updates or deletes should be reported by this function for removed volumes,
+    // as this is handled by the Dart side based on album removal.
+    assertTrue(result.updates.isEmpty())
+    assertTrue(result.deletes.isEmpty())
+
+    verify { mockContentResolver wasNot Called }
+  }
+
+  private data class MockAssetProperties(
+    val id: Long,
+    val path: String,
+    val displayName: String,
+    val dateTaken: Long,
+    val dateAdded: Long,
+    val dateModified: Long,
+    val mediaType: Int,
+    val bucketId: String,
+    val duration: Long
+  )
+
+  private fun mockCursorForMediaItems(items: List<MockAssetProperties>): Cursor {
+    val mockCursor = mockk<Cursor>()
+    var currentIndex = -1
+
+    every { mockCursor.moveToNext() } answers {
+      currentIndex++
+      currentIndex < items.size
+    }
+
+    if (items.isNotEmpty()) {
+      every { mockCursor.getColumnIndexOrThrow(MediaStore.MediaColumns._ID) } returns 0
+      every { mockCursor.getLong(0) } answers { items[currentIndex].id }
+      every { mockCursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA) } returns 1
+      every { mockCursor.getString(1) } answers { items[currentIndex].path }
+      every { mockCursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DISPLAY_NAME) } returns 2
+      every { mockCursor.getString(2) } answers { items[currentIndex].displayName }
+      every { mockCursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATE_TAKEN) } returns 3
+      every { mockCursor.getLong(3) } answers { items[currentIndex].dateTaken }
+      every { mockCursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATE_ADDED) } returns 4
+      every { mockCursor.getLong(4) } answers { items[currentIndex].dateAdded }
+      every { mockCursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATE_MODIFIED) } returns 5
+      every { mockCursor.getLong(5) } answers { items[currentIndex].dateModified }
+      every { mockCursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.MEDIA_TYPE) } returns 6
+      every { mockCursor.getInt(6) } answers { items[currentIndex].mediaType }
+      every { mockCursor.getColumnIndexOrThrow(MediaStore.MediaColumns.BUCKET_ID) } returns 7
+      every { mockCursor.getString(7) } answers { items[currentIndex].bucketId }
+      every { mockCursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DURATION) } returns 8
+      every { mockCursor.getLong(8) } answers { items[currentIndex].duration }
+    }
+    every { mockCursor.close() } answers { }
+    return mockCursor
+  }
+
+  private fun mockContentResolverQuery(
+    uri: Uri,
+    cursor: Cursor,
+    selectionSlot: CapturingSlot<String>? = null,
+    selectionArgsSlot: CapturingSlot<Array<String>>? = null
+  ) {
+    every {
+      mockContentResolver.query(
+        eq(uri),
+        any(),
+        if (selectionSlot != null) capture(selectionSlot) else any(),
+        if (selectionArgsSlot != null) capture(selectionArgsSlot) else any(),
+        null
+      )
+    } returns cursor
+  }
+
+}