let tests own the worker coroutine scopes

The repositories and the playback controller each created a hidden SupervisorJob scope and exposed close() only so tests could join it before closing the DB; production never called close(). Inject the scope instead and have each test cancel and join the scope it passes, so no test-only teardown lives in the app. Koin now provides the app/io/playback scopes.

Also read upcomingItem under the controller lock, and give the wall-clock test waits one shared 30s budget instead of 5s per file: a loaded runner could starve the controller's single thread past the old deadline.

app/src/main/kotlin/com/subtracks/data/download/DownloadNotifier.kt

@@ -13,11 +13,8 @@ import com.subtracks.R
 import com.subtracks.data.repo.DownloadRepository
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
-import kotlinx.coroutines.cancel
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.runBlocking
 
 /**
  * Our own aggregated progress notification for the downloads the platform engine runs. The engine's
@@ -27,8 +24,8 @@ import kotlinx.coroutines.runBlocking
 class DownloadNotifier(
     private val context: Context,
     private val repository: DownloadRepository,
+    private val scope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Default),
 ) {
-    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
     private val manager = NotificationManagerCompat.from(context)
 
     fun start() {
@@ -45,12 +42,6 @@ class DownloadNotifier(
         }
     }
 
-    internal fun close() {
-        val job = scope.coroutineContext[Job]
-        scope.cancel()
-        runBlocking { job?.join() }
-    }
-
     private fun build(content: DownloadNotification): Notification =
         NotificationCompat
             .Builder(context, CHANNEL_ID)

app/src/main/kotlin/com/subtracks/data/repo/DownloadRepository.kt

@@ -24,7 +24,6 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
-import kotlinx.coroutines.cancel
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -35,7 +34,6 @@ import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.withContext
@@ -51,8 +49,8 @@ class DownloadRepository(
     private val artworkFetcher: ArtworkFetcher,
     private val showMessage: (String) -> Unit = {},
     private val dispatcher: CoroutineDispatcher = Dispatchers.IO,
+    private val scope: CoroutineScope = CoroutineScope(SupervisorJob() + dispatcher),
 ) {
-    private val scope = CoroutineScope(SupervisorJob() + dispatcher)
     private val mutex = Mutex()
     private val loaded = CompletableDeferred<Unit>()
     private var pollJob: Job? = null
@@ -83,12 +81,6 @@ class DownloadRepository(
         }
     }
 
-    fun close() {
-        val job = scope.coroutineContext[Job]
-        scope.cancel()
-        runBlocking { job?.join() }
-    }
-
     fun states(): StateFlow<Map<String, SongDownload>> = statesFlow
 
     @OptIn(ExperimentalCoroutinesApi::class)

app/src/main/kotlin/com/subtracks/data/repo/LibraryRepository.kt

@@ -34,6 +34,7 @@ class LibraryRepository(
     private val sourceRepository: SourceRepository,
     private val serverActions: ServerActionSink,
     private val showMessage: (String) -> Unit = {},
+    private val scope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.IO),
 ) {
     val activeSourceId: Flow<Long?> = sourceRepository.activeSourceId()
 
@@ -280,21 +281,20 @@ class LibraryRepository(
         }
 
     private val starLock = Mutex()
-    private val starScope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
 
     fun star(
         type: StarType,
         id: String,
         starred: Boolean,
     ) {
-        starScope.launch { setStar(type, id, starred) }
+        scope.launch { setStar(type, id, starred) }
     }
 
     fun toggleStar(
         type: StarType,
         id: String,
     ) {
-        starScope.launch {
+        scope.launch {
             starLock.withLock {
                 val sourceId = sourceRepository.activeSourceIdOnce() ?: return@withLock
                 setStarLocked(type, id, starredValue(sourceId, type, id) == null)

app/src/main/kotlin/com/subtracks/data/repo/SourceRepository.kt

@@ -16,9 +16,7 @@ import com.subtracks.data.source.streamLengthSuffix
 import com.subtracks.data.source.subsonic.SubsonicClient
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
-import kotlinx.coroutines.cancel
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -26,7 +24,6 @@ import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withContext
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import okhttp3.OkHttpClient
@@ -39,9 +36,8 @@ class SourceRepository(
     private val artworkStore: ArtworkStore,
     networkMode: Flow<NetworkMode> = flowOf(NetworkMode.Wifi),
     private val showMessage: (String) -> Unit = {},
+    private val scope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Default),
 ) {
-    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
-
     private data class ActiveSource(
         val id: Long,
         val source: SubsonicMusicSource,
@@ -101,12 +97,6 @@ class SourceRepository(
         }
     }
 
-    fun close() {
-        val job = scope.coroutineContext[Job]
-        scope.cancel()
-        runBlocking { job?.join() }
-    }
-
     fun sources(): Flow<List<Source>> = db.sourcesDao().sources()
 
     fun activeSourceId(): Flow<Long?> = db.sourcesDao().activeSourceId()

app/src/main/kotlin/com/subtracks/data/sync/SyncManager.kt

@@ -7,14 +7,11 @@ import com.subtracks.data.repo.SourceRepository
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
-import kotlinx.coroutines.cancel
 import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.runBlocking
 
 sealed interface SyncStatus {
     data object Idle : SyncStatus
@@ -33,8 +30,8 @@ class SyncManager(
     private val sourceRepository: SourceRepository,
     private val queueRepository: QueueRepository,
     private val showMessage: (String) -> Unit = {},
+    private val scope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Default),
 ) {
-    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
     private val requests = Channel<Unit>(Channel.CONFLATED)
     private val _status = MutableStateFlow<SyncStatus>(SyncStatus.Idle)
     val status: StateFlow<SyncStatus> = _status
@@ -49,12 +46,6 @@ class SyncManager(
         requests.trySend(Unit)
     }
 
-    fun close() {
-        val job = scope.coroutineContext[Job]
-        scope.cancel()
-        runBlocking { job?.join() }
-    }
-
     private suspend fun runSync() {
         if (sourceRepository.offline.value) {
             showMessage("Offline mode is on")

app/src/main/kotlin/com/subtracks/di/AppModule.kt

@@ -37,8 +37,12 @@ import com.subtracks.ui.library.PlaylistDetailViewModel
 import com.subtracks.ui.playback.QueueViewModel
 import com.subtracks.ui.settings.AddSourceViewModel
 import com.subtracks.ui.settings.SettingsViewModel
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
 import okhttp3.OkHttpClient
 import org.koin.core.module.dsl.viewModel
+import org.koin.core.qualifier.named
 import org.koin.dsl.module
 import java.io.File
 
@@ -53,11 +57,24 @@ fun appModule(
     single { createAndroidDatabase(context) }
     single { http }
     single { createUserPreferences(context) }
-    single { SourceRepository(get(), get(), get(), get(), networkMode = networkMode(context.applicationContext), showMessage = toast) }
+    single { CoroutineScope(SupervisorJob() + Dispatchers.Default) }
+    single(named("io")) { CoroutineScope(SupervisorJob() + Dispatchers.IO) }
+    single(named("playback")) { CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate) }
+    single {
+        SourceRepository(
+            get(),
+            get(),
+            get(),
+            get(),
+            networkMode = networkMode(context.applicationContext),
+            showMessage = toast,
+            scope = get(),
+        )
+    }
     single<ServerActionSink> { NetworkServerActionSink(get()) }
-    single { LibraryRepository(get(), get(), get(), toast) }
+    single { LibraryRepository(get(), get(), get(), toast, scope = get(named("io"))) }
     single<ArtworkSeedStore> { ArtworkSeedRepository(get()) }
-    single { SyncManager(get(), get(), get(), showMessage = toast) }
+    single { SyncManager(get(), get(), get(), showMessage = toast, scope = get()) }
     single { QueueRepository(get()) }
     single { ArtworkStore(downloadsRoot(context)) }
     single<ArtworkFetcher> { OkHttpArtworkFetcher(get()) }
@@ -71,16 +88,19 @@ fun appModule(
             artworkStore = get(),
             artworkFetcher = get(),
             showMessage = toast,
+            dispatcher = Dispatchers.IO,
+            scope = get(named("io")),
         ).also { it.start() }
     }
-    single(createdAtStart = true) { DownloadNotifier(context.applicationContext, get()).also { it.start() } }
+    single(createdAtStart = true) { DownloadNotifier(context.applicationContext, get(), scope = get()).also { it.start() } }
     single<PlayerConnection> { MediaSessionConnection(context.applicationContext, get(), get()) }
-    single { PlaybackController(get(), get(), get(), get(), showMessage = toast) }
+    single { PlaybackController(get(), get(), get(), get(), showMessage = toast, scope = get(named("playback"))) }
     single(createdAtStart = true) {
         val playback = get<PlaybackController>()
         Scrobbler(
             sink = get(),
             enabled = get<UserPreferences>().scrobbling(),
+            scope = get(),
             recordPlay = get<LibraryRepository>()::recordPlay,
         ).also {
             it.attach(playback.state, playback.positionMs)

app/src/main/kotlin/com/subtracks/playback/PlaybackController.kt

@@ -11,12 +11,10 @@ import com.subtracks.data.repo.QueueWindowItem
 import com.subtracks.data.repo.Shuffle
 import com.subtracks.data.repo.SourceRepository
 import kotlinx.coroutines.CancellationException
-import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
-import kotlinx.coroutines.cancel
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -111,9 +109,8 @@ class PlaybackController(
     private val connection: PlayerConnection,
     private val downloads: DownloadRepository,
     private val showMessage: (String) -> Unit = {},
-    dispatcher: CoroutineDispatcher = Dispatchers.Main.immediate,
+    private val scope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate),
 ) {
-    private val scope = CoroutineScope(SupervisorJob() + dispatcher)
     private val _state = MutableStateFlow(PlaybackState())
     val state: StateFlow<PlaybackState> = _state
 
@@ -169,14 +166,6 @@ class PlaybackController(
         }
     }
 
-    fun close() {
-        scope.cancel()
-    }
-
-    internal suspend fun awaitStopped() {
-        scope.coroutineContext[Job]?.join()
-    }
-
     private val _ready = MutableStateFlow(false)
     val ready: StateFlow<Boolean> = _ready
 
@@ -879,11 +868,12 @@ class PlaybackController(
         thumbnail: Boolean = false,
     ): CoverArtRef? = sourceRepository.coverArt(item?.coverArtId, thumbnail)
 
-    suspend fun upcomingItem(): QueueItem? {
-        val snap = snapshot ?: return null
-        val position = currentPosition() ?: return null
-        return queueRepository.itemAt(snap, position + 1)?.toQueueItem()
-    }
+    suspend fun upcomingItem(): QueueItem? =
+        startLock.withLock {
+            val snap = snapshot ?: return@withLock null
+            val position = currentPosition() ?: return@withLock null
+            queueRepository.itemAt(snap, position + 1)?.toQueueItem()
+        }
 
     private fun play(
         entries: List<QueueEntry>,

app/src/test/kotlin/com/subtracks/TestSupport.kt

@@ -0,0 +1,15 @@
+package com.subtracks
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.cancelAndJoin
+import kotlinx.coroutines.runBlocking
+
+// Wall-clock budget for the tests that poll asynchronous playback/repository work on a real
+// dispatcher. A loaded CI runner can starve those threads for seconds; this only needs to catch a
+// real hang, not a slow machine.
+const val TEST_TIMEOUT_MS = 30_000L
+
+fun cancelAndJoinBlocking(vararg scopes: CoroutineScope) {
+    runBlocking { scopes.forEach { it.coroutineContext[Job]?.cancelAndJoin() } }
+}

app/src/test/kotlin/com/subtracks/data/repo/DownloadRepositoryTest.kt

@@ -6,6 +6,7 @@ import androidx.room3.Room
 import androidx.sqlite.driver.bundled.BundledSQLiteDriver
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.subtracks.TEST_TIMEOUT_MS
 import com.subtracks.data.db.SubtracksDatabase
 import com.subtracks.data.download.ArtworkFetcher
 import com.subtracks.data.download.ArtworkStore
@@ -24,7 +25,11 @@ import com.subtracks.data.model.Source
 import com.subtracks.data.model.SubsonicSource
 import com.subtracks.data.model.coverArtKey
 import com.subtracks.data.prefs.fakeUserPreferences
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancelAndJoin
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
@@ -52,6 +57,7 @@ class DownloadRepositoryTest {
     private lateinit var repository: DownloadRepository
     private lateinit var artwork: ArtworkStore
     private lateinit var dir: File
+    private lateinit var scope: CoroutineScope
     private val prefs = fakeUserPreferences()
     private val messages = CopyOnWriteArrayList<String>()
     private val requestedArt = CopyOnWriteArrayList<String>()
@@ -74,7 +80,8 @@ class DownloadRepositoryTest {
                 .setDriver(BundledSQLiteDriver())
                 .build()
         artwork = ArtworkStore(File(context.cacheDir, "art-${System.nanoTime()}"))
-        sources = SourceRepository(db, OkHttpClient(), prefs, artwork)
+        scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+        sources = SourceRepository(db, OkHttpClient(), prefs, artwork, scope = scope)
         engine = FakeDownloadEngine()
         dir = File(context.cacheDir, "downloads-${System.nanoTime()}")
         repository =
@@ -86,13 +93,13 @@ class DownloadRepositoryTest {
                 artworkStore = artwork,
                 artworkFetcher = fetcher,
                 showMessage = { messages += it },
+                scope = scope,
             )
     }
 
     @After
     fun tearDown() {
-        repository.close()
-        sources.close()
+        runBlocking { scope.coroutineContext[Job]?.cancelAndJoin() }
         db.close()
         dir.deleteRecursively()
     }
@@ -1153,9 +1160,9 @@ class DownloadRepositoryTest {
     }
 
     private fun await(predicate: () -> Boolean) {
-        val deadline = System.nanoTime() + 5_000_000_000L
+        val deadline = System.nanoTime() + TEST_TIMEOUT_MS * 1_000_000
         while (!predicate() && System.nanoTime() < deadline) Thread.sleep(10)
-        assertTrue("Timed out waiting for the expected download state", predicate())
+        assertTrue("Timed out after ${TEST_TIMEOUT_MS}ms waiting for the expected download state", predicate())
     }
 
     private companion object {

app/src/test/kotlin/com/subtracks/data/repo/LibraryRepositoryTest.kt

@@ -10,6 +10,11 @@ import com.subtracks.data.download.ArtworkStore
 import com.subtracks.data.model.Song
 import com.subtracks.data.prefs.fakeUserPreferences
 import com.subtracks.data.source.StarType
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancelAndJoin
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
@@ -34,6 +39,7 @@ class LibraryRepositoryTest {
     private lateinit var db: SubtracksDatabase
     private lateinit var sourceRepository: SourceRepository
     private lateinit var repository: LibraryRepository
+    private lateinit var scope: CoroutineScope
     private val messages = ArrayList<String>()
 
     @Before
@@ -44,13 +50,22 @@ class LibraryRepositoryTest {
                 .inMemoryDatabaseBuilder(context, SubtracksDatabase::class.java)
                 .setDriver(BundledSQLiteDriver())
                 .build()
-        sourceRepository = SourceRepository(db, OkHttpClient(), fakeUserPreferences(), ArtworkStore(File(context.cacheDir, "art")))
-        repository = LibraryRepository(db, sourceRepository, NetworkServerActionSink(sourceRepository), showMessage = { messages += it })
+        scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+        sourceRepository =
+            SourceRepository(db, OkHttpClient(), fakeUserPreferences(), ArtworkStore(File(context.cacheDir, "art")), scope = scope)
+        repository =
+            LibraryRepository(
+                db,
+                sourceRepository,
+                NetworkServerActionSink(sourceRepository),
+                showMessage = { messages += it },
+                scope = scope,
+            )
     }
 
     @After
     fun tearDown() {
-        sourceRepository.close()
+        runBlocking { scope.coroutineContext[Job]?.cancelAndJoin() }
         db.close()
     }
 

app/src/test/kotlin/com/subtracks/data/repo/SourceRepositoryTest.kt

@@ -5,6 +5,7 @@ import androidx.room3.Room
 import androidx.sqlite.driver.bundled.BundledSQLiteDriver
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.subtracks.TEST_TIMEOUT_MS
 import com.subtracks.data.db.SubtracksDatabase
 import com.subtracks.data.download.ArtworkStore
 import com.subtracks.data.model.CoverArtRef
@@ -12,8 +13,12 @@ import com.subtracks.data.model.coverArtKey
 import com.subtracks.data.prefs.StreamQuality
 import com.subtracks.data.prefs.UserPreferences
 import com.subtracks.data.prefs.fakeUserPreferences
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.async
+import kotlinx.coroutines.cancelAndJoin
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.toList
@@ -43,6 +48,7 @@ class SourceRepositoryTest {
     private lateinit var prefs: UserPreferences
     private lateinit var repository: SourceRepository
     private lateinit var artwork: ArtworkStore
+    private lateinit var scope: CoroutineScope
     private val messages = ArrayList<String>()
 
     @Before
@@ -55,12 +61,13 @@ class SourceRepositoryTest {
                 .build()
         artwork = ArtworkStore(File(context.cacheDir, "art-${System.nanoTime()}"))
         prefs = fakeUserPreferences()
-        repository = SourceRepository(db, OkHttpClient(), prefs, artwork, showMessage = { messages += it })
+        scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+        repository = SourceRepository(db, OkHttpClient(), prefs, artwork, showMessage = { messages += it }, scope = scope)
     }
 
     @After
     fun tearDown() {
-        repository.close()
+        runBlocking { scope.coroutineContext[Job]?.cancelAndJoin() }
         db.close()
     }
 
@@ -69,14 +76,14 @@ class SourceRepositoryTest {
         runBlocking {
             repository.addSource("nav", "http://a.example/", "u", "p", false)
             val sourceId = repository.activeSourceId().first()!!
-            withTimeout(5_000) { while (repository.downloadUri(sourceId, "s1") == null) delay(10) }
+            withTimeout(TEST_TIMEOUT_MS) { while (repository.downloadUri(sourceId, "s1") == null) delay(10) }
 
             assertTrue(repository.downloadUri(sourceId, "s1")!!.contains("/rest/download"))
 
             prefs.setDownloadQuality(StreamQuality(maxBitrate = 128, format = "opus"))
 
             var transcoded: String? = null
-            withTimeout(5_000) {
+            withTimeout(TEST_TIMEOUT_MS) {
                 while (transcoded == null) {
                     delay(10)
                     transcoded = repository.downloadUri(sourceId, "s1")?.takeIf { it.contains("/rest/stream") }
@@ -155,9 +162,9 @@ class SourceRepositoryTest {
 
                 repository.addSource("nav", server.url("/").toString(), "u", "s3cret", true)
 
-                val config = withTimeout(5_000) { repository.activeConfig().first { it != null && !it.useTokenAuth } }
+                val config = withTimeout(TEST_TIMEOUT_MS) { repository.activeConfig().first { it != null && !it.useTokenAuth } }
                 assertFalse(config!!.useTokenAuth)
-                withTimeout(5_000) { while (messages.isEmpty()) delay(10) }
+                withTimeout(TEST_TIMEOUT_MS) { while (messages.isEmpty()) delay(10) }
                 assertEquals(1, messages.size)
             }
         }
@@ -250,7 +257,7 @@ class SourceRepositoryTest {
             repository.addSource("server", "http://a.example/", "u", "p", true)
             val sourceId = awaitActiveSourceId()
             repository.setOfflineMode(true)
-            withTimeout(5_000) { repository.offline.first { it } }
+            withTimeout(TEST_TIMEOUT_MS) { repository.offline.first { it } }
 
             assertEquals(null, repository.streamUri("s1", 1_000L, StreamQuality()))
             assertEquals(null, repository.networkCoverArt(sourceId, "art-1", false))
@@ -266,17 +273,17 @@ class SourceRepositoryTest {
             val sourceId = awaitActiveSourceId()
             artwork.write(sourceId, coverArtKey(sourceId, "art-1", false), byteArrayOf(1, 2, 3))
             repository.setOfflineMode(true)
-            withTimeout(5_000) { repository.offline.first { it } }
+            withTimeout(TEST_TIMEOUT_MS) { repository.offline.first { it } }
 
             val ref = awaitCoverArt("art-1")
 
             assertTrue("expected the stored file, was ${ref.url}", ref.url.startsWith("file:"))
         }
 
-    private suspend fun awaitActiveSourceId(): Long = withTimeout(5_000) { repository.activeSourceId().first { it != null }!! }
+    private suspend fun awaitActiveSourceId(): Long = withTimeout(TEST_TIMEOUT_MS) { repository.activeSourceId().first { it != null }!! }
 
     private suspend fun awaitCoverArt(coverArt: String): CoverArtRef =
-        withTimeout(5_000) {
+        withTimeout(TEST_TIMEOUT_MS) {
             var ref = repository.coverArt(coverArt)
             while (ref == null) {
                 delay(10)

app/src/test/kotlin/com/subtracks/data/sync/SyncManagerTest.kt

@@ -5,11 +5,17 @@ import androidx.room3.Room
 import androidx.sqlite.driver.bundled.BundledSQLiteDriver
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.subtracks.TEST_TIMEOUT_MS
 import com.subtracks.data.db.SubtracksDatabase
 import com.subtracks.data.download.ArtworkStore
 import com.subtracks.data.prefs.fakeUserPreferences
 import com.subtracks.data.repo.QueueRepository
 import com.subtracks.data.repo.SourceRepository
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancelAndJoin
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withTimeout
@@ -37,6 +43,7 @@ class SyncManagerTest {
     private lateinit var sourceRepository: SourceRepository
     private lateinit var queueRepository: QueueRepository
     private lateinit var manager: SyncManager
+    private lateinit var scope: CoroutineScope
     private val messages = CopyOnWriteArrayList<String>()
     private lateinit var server: MockWebServer
 
@@ -48,17 +55,18 @@ class SyncManagerTest {
                 .inMemoryDatabaseBuilder(context, SubtracksDatabase::class.java)
                 .setDriver(BundledSQLiteDriver())
                 .build()
-        sourceRepository = SourceRepository(db, OkHttpClient(), fakeUserPreferences(), ArtworkStore(File(context.cacheDir, "art")))
+        scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+        sourceRepository =
+            SourceRepository(db, OkHttpClient(), fakeUserPreferences(), ArtworkStore(File(context.cacheDir, "art")), scope = scope)
         queueRepository = QueueRepository(db)
-        manager = SyncManager(db, sourceRepository, queueRepository, showMessage = { messages += it })
+        manager = SyncManager(db, sourceRepository, queueRepository, showMessage = { messages += it }, scope = scope)
         server = MockWebServer()
         server.start()
     }
 
     @After
     fun tearDown() {
-        manager.close()
-        sourceRepository.close()
+        runBlocking { scope.coroutineContext[Job]?.cancelAndJoin() }
         db.close()
         server.shutdown()
     }
@@ -67,7 +75,7 @@ class SyncManagerTest {
     fun aFailedSyncTellsTheUser() =
         runBlocking {
             manager.requestSync()
-            withTimeout(10_000) { manager.status.first { it is SyncStatus.Failed } }
+            withTimeout(TEST_TIMEOUT_MS) { manager.status.first { it is SyncStatus.Failed } }
 
             assertEquals(listOf("Sync failed: No server configured"), messages)
         }
@@ -78,7 +86,7 @@ class SyncManagerTest {
             val before = queueRepository.snapshot().version
 
             manager.requestSync()
-            val status = withTimeout(10_000) { manager.status.first { it is SyncStatus.Failed } }
+            val status = withTimeout(TEST_TIMEOUT_MS) { manager.status.first { it is SyncStatus.Failed } }
 
             assertTrue(status is SyncStatus.Failed)
             assertEquals(before + 1, queueRepository.snapshot().version)
@@ -91,7 +99,7 @@ class SyncManagerTest {
             sourceRepository.addSource("Local", server.url("/").toString(), "u", "p", useTokenAuth = false)
 
             manager.requestSync()
-            withTimeout(10_000) { manager.status.first { it is SyncStatus.Success } }
+            withTimeout(TEST_TIMEOUT_MS) { manager.status.first { it is SyncStatus.Success } }
 
             assertEquals(listOf("ar1"), db.libraryDao().artistIds(1))
             assertEquals(listOf("al1"), db.libraryDao().albumIds(1))
@@ -128,13 +136,13 @@ class SyncManagerTest {
             sourceRepository.addSource("Local", server.url("/").toString(), "u", "p", useTokenAuth = false)
 
             manager.requestSync()
-            withTimeout(10_000) { manager.status.first { it is SyncStatus.Failed } }
+            withTimeout(TEST_TIMEOUT_MS) { manager.status.first { it is SyncStatus.Failed } }
 
             assertEquals(listOf("ar1"), db.libraryDao().artistIds(1))
 
             server.dispatcher = healthyDispatcher()
             manager.requestSync()
-            withTimeout(10_000) { manager.status.first { it is SyncStatus.Success } }
+            withTimeout(TEST_TIMEOUT_MS) { manager.status.first { it is SyncStatus.Success } }
 
             assertEquals(listOf("ar1"), db.libraryDao().artistIds(1))
             assertEquals(listOf("al1"), db.libraryDao().albumIds(1))
@@ -173,7 +181,7 @@ class SyncManagerTest {
             manager.requestSync()
             releaseFirst.countDown()
 
-            withTimeout(10_000) { manager.status.first { it is SyncStatus.Success } }
+            withTimeout(TEST_TIMEOUT_MS) { manager.status.first { it is SyncStatus.Success } }
             assertTrue("the coalesced sync should start", secondArtistStarted.await(10, TimeUnit.SECONDS))
             assertEquals(2, artistRequests.get())
         }
@@ -230,10 +238,10 @@ class SyncManagerTest {
     fun aSyncRequestWhileOfflineIsRefusedWithoutTouchingTheNetwork() =
         runBlocking {
             sourceRepository.setOfflineMode(true)
-            withTimeout(5_000) { sourceRepository.offline.first { it } }
+            withTimeout(TEST_TIMEOUT_MS) { sourceRepository.offline.first { it } }
 
             manager.requestSync()
-            val status = withTimeout(10_000) { manager.status.first { it is SyncStatus.Failed } }
+            val status = withTimeout(TEST_TIMEOUT_MS) { manager.status.first { it is SyncStatus.Failed } }
 
             assertEquals("Offline mode is on", (status as SyncStatus.Failed).message)
         }

app/src/test/kotlin/com/subtracks/di/AppModuleTest.kt

@@ -3,10 +3,17 @@ package com.subtracks.di
 import android.content.Context
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
-import com.subtracks.data.download.DownloadNotifier
 import com.subtracks.data.repo.DownloadRepository
-import com.subtracks.data.repo.SourceRepository
 import com.subtracks.playback.PlaybackController
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.cancelAndJoin
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.setMain
 import okhttp3.OkHttpClient
 import org.junit.After
 import org.junit.Assert.assertSame
@@ -16,25 +23,31 @@ import org.junit.runner.RunWith
 import org.koin.core.Koin
 import org.koin.core.context.startKoin
 import org.koin.core.context.stopKoin
+import org.koin.core.qualifier.named
 
+@OptIn(ExperimentalCoroutinesApi::class)
 @RunWith(AndroidJUnit4::class)
 class AppModuleTest {
     private lateinit var koin: Koin
+    private val mainDispatcher = UnconfinedTestDispatcher()
 
     @Before
-    fun setUp() = stopKoin()
+    fun setUp() {
+        stopKoin()
+        Dispatchers.setMain(mainDispatcher)
+    }
 
     @After
     fun tearDown() {
         if (::koin.isInitialized) {
-            runCatching {
-                koin.get<DownloadNotifier>().close()
-                koin.get<PlaybackController>().close()
-                koin.get<DownloadRepository>().close()
-                koin.get<SourceRepository>().close()
+            runBlocking {
+                koin.get<CoroutineScope>().coroutineContext[Job]?.cancelAndJoin()
+                koin.get<CoroutineScope>(named("io")).coroutineContext[Job]?.cancelAndJoin()
+                koin.get<CoroutineScope>(named("playback")).coroutineContext[Job]?.cancelAndJoin()
             }
         }
         stopKoin()
+        Dispatchers.resetMain()
     }
 
     @Test

app/src/test/kotlin/com/subtracks/playback/PlaybackControllerTest.kt

@@ -6,6 +6,8 @@ import androidx.room3.Room
 import androidx.sqlite.driver.bundled.BundledSQLiteDriver
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.subtracks.TEST_TIMEOUT_MS
+import com.subtracks.cancelAndJoinBlocking
 import com.subtracks.data.db.SubtracksDatabase
 import com.subtracks.data.download.ArtworkStore
 import com.subtracks.data.download.FakeDownloadEngine
@@ -26,7 +28,10 @@ import com.subtracks.data.prefs.fakeUserPreferences
 import com.subtracks.data.repo.DownloadRepository
 import com.subtracks.data.repo.QueueRepository
 import com.subtracks.data.repo.SourceRepository
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.asCoroutineDispatcher
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -52,6 +57,9 @@ import java.util.concurrent.Executors
 @RunWith(AndroidJUnit4::class)
 class PlaybackControllerTest {
     private val dispatcher = Executors.newSingleThreadExecutor().asCoroutineDispatcher()
+    private val repoScope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+    private val controllerScope = CoroutineScope(SupervisorJob() + dispatcher)
+    private val extraScopes = mutableListOf<CoroutineScope>()
 
     private lateinit var db: SubtracksDatabase
     private lateinit var prefs: UserPreferences
@@ -74,7 +82,15 @@ class PlaybackControllerTest {
                 .build()
         prefs = fakeUserPreferences()
         networkMode = MutableStateFlow(NetworkMode.Wifi)
-        sources = SourceRepository(db, OkHttpClient(), prefs, ArtworkStore(File(context.cacheDir, "art")), networkMode = networkMode)
+        sources =
+            SourceRepository(
+                db,
+                OkHttpClient(),
+                prefs,
+                ArtworkStore(File(context.cacheDir, "art")),
+                networkMode = networkMode,
+                scope = repoScope,
+            )
         queues = QueueRepository(db)
         downloadsDir = File(context.cacheDir, "downloads-${System.nanoTime()}")
         downloads =
@@ -85,6 +101,7 @@ class PlaybackControllerTest {
                 downloadsDir,
                 artworkStore = ArtworkStore(File(context.cacheDir, "art")),
                 artworkFetcher = { ByteArray(0) },
+                scope = repoScope,
             ).also { it.start() }
         handle = FakePlayerHandle()
         controller =
@@ -94,16 +111,13 @@ class PlaybackControllerTest {
                 FakePlayerConnection(handle),
                 downloads,
                 showMessage = { messages += it },
-                dispatcher = dispatcher,
+                scope = controllerScope,
             )
     }
 
     @After
     fun tearDown() {
-        controller.close()
-        runBlocking { controller.awaitStopped() }
-        sources.close()
-        downloads.close()
+        cancelAndJoinBlocking(controllerScope, repoScope, *extraScopes.toTypedArray())
         db.close()
         dispatcher.close()
     }
@@ -649,7 +663,7 @@ class PlaybackControllerTest {
         runBlocking { queues.setPosition(12_000L) }
 
         val restoredHandle = FakePlayerHandle()
-        val restored = PlaybackController(sources, queues, FakePlayerConnection(restoredHandle), downloads, dispatcher = dispatcher)
+        val restored = controllerOn(dispatcher, restoredHandle)
         restored.connect()
         await {
             restored.state.value.item
@@ -657,7 +671,6 @@ class PlaybackControllerTest {
         }
 
         assertEquals(12_000L, restored.positionMs.value)
-        restored.close()
     }
 
     @Test
@@ -757,7 +770,7 @@ class PlaybackControllerTest {
                     block: Runnable,
                 ) = block.run()
             }
-        val eager = PlaybackController(sources, queues, FakePlayerConnection(eagerHandle), downloads, dispatcher = inline)
+        val eager = controllerOn(inline, eagerHandle)
 
         eager.playAlbum(1, "al1", 0)
         await {
@@ -787,7 +800,6 @@ class PlaybackControllerTest {
                 ?.id,
         )
         assertEquals("q2", runBlocking { eager.upcomingItem()?.id })
-        eager.close()
     }
 
     @Test
@@ -804,7 +816,7 @@ class PlaybackControllerTest {
                     block: Runnable,
                 ) = block.run()
             }
-        val eager = PlaybackController(sources, queues, FakePlayerConnection(eagerHandle), downloads, dispatcher = inline)
+        val eager = controllerOn(inline, eagerHandle)
 
         eager.playAlbum(1, "al1", 0)
         await {
@@ -830,7 +842,6 @@ class PlaybackControllerTest {
                 ?.id,
         )
         assertEquals(3, runBlocking { queues.snapshot().upNext.size })
-        eager.close()
     }
 
     @Test
@@ -847,7 +858,7 @@ class PlaybackControllerTest {
                     block: Runnable,
                 ) = block.run()
             }
-        val eager = PlaybackController(sources, queues, FakePlayerConnection(eagerHandle), downloads, dispatcher = inline)
+        val eager = controllerOn(inline, eagerHandle)
 
         eager.playAlbum(1, "al1", 0)
         await {
@@ -873,7 +884,6 @@ class PlaybackControllerTest {
                 ?.id,
         )
         assertEquals(3L, runBlocking { queues.snapshot().upNextSize })
-        eager.close()
     }
 
     @Test
@@ -890,7 +900,7 @@ class PlaybackControllerTest {
                     block: Runnable,
                 ) = block.run()
             }
-        val eager = PlaybackController(sources, queues, FakePlayerConnection(eagerHandle), downloads, dispatcher = inline)
+        val eager = controllerOn(inline, eagerHandle)
 
         eager.playAlbum(1, "al1", 0)
         await {
@@ -920,7 +930,6 @@ class PlaybackControllerTest {
 
         val queued = runBlocking { queues.snapshot().upNext.map { it.entry.refId } }
         assertTrue("c1" in queued)
-        eager.close()
     }
 
     @Test
@@ -2308,7 +2317,7 @@ class PlaybackControllerTest {
         runBlocking { queues.setPosition(12_000L) }
 
         val restoredHandle = FakePlayerHandle()
-        val restored = PlaybackController(sources, queues, FakePlayerConnection(restoredHandle), downloads, dispatcher = dispatcher)
+        val restored = controllerOn(dispatcher, restoredHandle)
         restored.connect()
         await {
             restored.state.value.item
@@ -2321,7 +2330,6 @@ class PlaybackControllerTest {
             "setWindow(size=3, start=0, position=12000)",
             restoredHandle.operations.first { it.startsWith("setWindow") },
         )
-        restored.close()
     }
 
     @Test
@@ -2890,7 +2898,7 @@ class PlaybackControllerTest {
         songId: String,
     ) {
         val file = File(downloadsDir, "$sourceId/$songId")
-        val deadline = System.nanoTime() + 15_000_000_000L
+        val deadline = System.nanoTime() + TEST_TIMEOUT_MS * 1_000_000
         while (System.nanoTime() < deadline) {
             runBlocking {
                 db.downloadDao().upsert(SongDownload(sourceId, songId, DownloadStatus.Completed))
@@ -2906,12 +2914,12 @@ class PlaybackControllerTest {
 
     private fun setOffline() {
         sources.setOfflineMode(true)
-        runBlocking { withTimeout(5_000) { sources.offline.first { it } } }
+        runBlocking { withTimeout(TEST_TIMEOUT_MS) { sources.offline.first { it } } }
     }
 
     private fun setOnline() {
         sources.setOfflineMode(false)
-        runBlocking { withTimeout(5_000) { sources.offline.first { !it } } }
+        runBlocking { withTimeout(TEST_TIMEOUT_MS) { sources.offline.first { !it } } }
     }
 
     private fun seedAlbum(
@@ -3063,9 +3071,17 @@ class PlaybackControllerTest {
             (0 until snapshot.size).mapNotNull { queues.itemAt(snapshot, it)?.song?.id }
         }
 
+    private fun controllerOn(
+        dispatcher: CoroutineDispatcher,
+        handle: FakePlayerHandle,
+    ): PlaybackController {
+        val scope = CoroutineScope(SupervisorJob() + dispatcher).also { extraScopes += it }
+        return PlaybackController(sources, queues, FakePlayerConnection(handle), downloads, scope = scope)
+    }
+
     private fun await(predicate: () -> Boolean) {
-        val deadline = System.nanoTime() + 5_000_000_000L
+        val deadline = System.nanoTime() + TEST_TIMEOUT_MS * 1_000_000
         while (!predicate() && System.nanoTime() < deadline) Thread.sleep(10)
-        assertTrue("Timed out waiting for the expected playback state", predicate())
+        assertTrue("Timed out after ${TEST_TIMEOUT_MS}ms waiting for the expected playback state", predicate())
     }
 }

app/src/test/kotlin/com/subtracks/ui/downloads/DownloadsViewModelTest.kt

@@ -6,6 +6,8 @@ import androidx.room3.Room
 import androidx.sqlite.driver.bundled.BundledSQLiteDriver
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.subtracks.TEST_TIMEOUT_MS
+import com.subtracks.cancelAndJoinBlocking
 import com.subtracks.data.db.SubtracksDatabase
 import com.subtracks.data.download.ArtworkStore
 import com.subtracks.data.download.FakeDownloadEngine
@@ -22,9 +24,11 @@ import com.subtracks.data.repo.SourceRepository
 import com.subtracks.playback.FakePlayerConnection
 import com.subtracks.playback.FakePlayerHandle
 import com.subtracks.playback.PlaybackController
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.asCoroutineDispatcher
 import kotlinx.coroutines.cancelAndJoin
 import kotlinx.coroutines.runBlocking
@@ -51,6 +55,8 @@ class DownloadsViewModelTest {
     private lateinit var downloadRepository: DownloadRepository
     private lateinit var controller: PlaybackController
     private lateinit var viewModel: DownloadsViewModel
+    private val repoScope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+    private val controllerScope = CoroutineScope(SupervisorJob() + dispatcher)
     private var sourceId: Long = 0
 
     @Before
@@ -63,7 +69,7 @@ class DownloadsViewModelTest {
                 .setDriver(BundledSQLiteDriver())
                 .build()
         val artwork = ArtworkStore(File(context.cacheDir, "art-${System.nanoTime()}"))
-        sourceRepository = SourceRepository(db, OkHttpClient(), fakeUserPreferences(), artwork)
+        sourceRepository = SourceRepository(db, OkHttpClient(), fakeUserPreferences(), artwork, scope = repoScope)
         downloadRepository =
             DownloadRepository(
                 db,
@@ -72,6 +78,7 @@ class DownloadsViewModelTest {
                 File(context.cacheDir, "downloads-${System.nanoTime()}"),
                 artworkStore = artwork,
                 artworkFetcher = { ByteArray(0) },
+                scope = repoScope,
             )
         controller =
             PlaybackController(
@@ -79,11 +86,11 @@ class DownloadsViewModelTest {
                 QueueRepository(db),
                 FakePlayerConnection(FakePlayerHandle()),
                 downloadRepository,
-                dispatcher = dispatcher,
+                scope = controllerScope,
             )
         viewModel =
             DownloadsViewModel(
-                LibraryRepository(db, sourceRepository, NetworkServerActionSink(sourceRepository)),
+                LibraryRepository(db, sourceRepository, NetworkServerActionSink(sourceRepository), scope = repoScope),
                 downloadRepository,
                 controller,
             )
@@ -92,10 +99,7 @@ class DownloadsViewModelTest {
     @After
     fun tearDown() {
         runBlocking { viewModel.viewModelScope.coroutineContext[Job]?.cancelAndJoin() }
-        controller.close()
-        runBlocking { controller.awaitStopped() }
-        downloadRepository.close()
-        sourceRepository.close()
+        cancelAndJoinBlocking(controllerScope, repoScope)
         db.close()
         Dispatchers.resetMain()
         dispatcher.close()
@@ -174,8 +178,8 @@ class DownloadsViewModelTest {
     private fun allRows(): List<SongDownload> = runBlocking { db.downloadDao().all() }
 
     private fun await(predicate: () -> Boolean) {
-        val deadline = System.nanoTime() + 5_000_000_000L
+        val deadline = System.nanoTime() + TEST_TIMEOUT_MS * 1_000_000
         while (!predicate() && System.nanoTime() < deadline) Thread.sleep(10)
-        assertTrue("Timed out waiting for the expected state", predicate())
+        assertTrue("Timed out after ${TEST_TIMEOUT_MS}ms waiting for the expected state", predicate())
     }
 }

app/src/test/kotlin/com/subtracks/ui/playback/QueueViewModelTest.kt

@@ -6,6 +6,8 @@ import androidx.room3.Room
 import androidx.sqlite.driver.bundled.BundledSQLiteDriver
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.subtracks.TEST_TIMEOUT_MS
+import com.subtracks.cancelAndJoinBlocking
 import com.subtracks.data.db.SubtracksDatabase
 import com.subtracks.data.download.ArtworkStore
 import com.subtracks.data.download.FakeDownloadEngine
@@ -22,9 +24,11 @@ import com.subtracks.data.repo.SourceRepository
 import com.subtracks.playback.FakePlayerConnection
 import com.subtracks.playback.FakePlayerHandle
 import com.subtracks.playback.PlaybackController
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.asCoroutineDispatcher
 import kotlinx.coroutines.cancelAndJoin
 import kotlinx.coroutines.flow.first
@@ -56,6 +60,8 @@ class QueueViewModelTest {
     private lateinit var downloadsDir: File
     private lateinit var controller: PlaybackController
     private lateinit var viewModel: QueueViewModel
+    private val repoScope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+    private val controllerScope = CoroutineScope(SupervisorJob() + dispatcher)
 
     @Before
     fun setUp() {
@@ -66,7 +72,8 @@ class QueueViewModelTest {
                 .inMemoryDatabaseBuilder(context, SubtracksDatabase::class.java)
                 .setDriver(BundledSQLiteDriver())
                 .build()
-        sources = SourceRepository(db, OkHttpClient(), fakeUserPreferences(), ArtworkStore(File(context.cacheDir, "art")))
+        sources =
+            SourceRepository(db, OkHttpClient(), fakeUserPreferences(), ArtworkStore(File(context.cacheDir, "art")), scope = repoScope)
         queues = QueueRepository(db)
         val artwork = ArtworkStore(File(context.cacheDir, "art"))
         downloadsDir = File(context.cacheDir, "downloads-${System.nanoTime()}")
@@ -78,18 +85,16 @@ class QueueViewModelTest {
                 downloadsDir,
                 artworkStore = artwork,
                 artworkFetcher = { ByteArray(0) },
+                scope = repoScope,
             ).also { it.start() }
-        controller = PlaybackController(sources, queues, FakePlayerConnection(FakePlayerHandle()), downloads, dispatcher = dispatcher)
+        controller = PlaybackController(sources, queues, FakePlayerConnection(FakePlayerHandle()), downloads, scope = controllerScope)
         viewModel = QueueViewModel(queues, controller, sources, downloads)
     }
 
     @After
     fun tearDown() {
         runBlocking { viewModel.viewModelScope.coroutineContext[Job]?.cancelAndJoin() }
-        controller.close()
-        runBlocking { controller.awaitStopped() }
-        downloads.close()
-        sources.close()
+        cancelAndJoinBlocking(controllerScope, repoScope)
         db.close()
         Dispatchers.resetMain()
         dispatcher.close()
@@ -455,7 +460,7 @@ class QueueViewModelTest {
     private fun setOffline() {
         runBlocking {
             sources.setOfflineMode(true)
-            withTimeout(5_000) { sources.offline.first { it } }
+            withTimeout(TEST_TIMEOUT_MS) { sources.offline.first { it } }
         }
     }
 
@@ -514,10 +519,8 @@ class QueueViewModelTest {
     private fun runOnMain(block: () -> Unit) = runBlocking { withContext(dispatcher) { block() } }
 
     private fun await(predicate: () -> Boolean) {
-        repeat(500) {
-            if (predicate()) return
-            Thread.sleep(10)
-        }
-        assertTrue("Timed out waiting for the expected state", predicate())
+        val deadline = System.nanoTime() + TEST_TIMEOUT_MS * 1_000_000
+        while (!predicate() && System.nanoTime() < deadline) Thread.sleep(10)
+        assertTrue("Timed out after ${TEST_TIMEOUT_MS}ms waiting for the expected state", predicate())
     }
 }

app/src/test/kotlin/com/subtracks/ui/settings/AddSourceViewModelTest.kt

@@ -6,6 +6,8 @@ import androidx.room3.Room
 import androidx.sqlite.driver.bundled.BundledSQLiteDriver
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.subtracks.TEST_TIMEOUT_MS
+import com.subtracks.cancelAndJoinBlocking
 import com.subtracks.data.db.SubtracksDatabase
 import com.subtracks.data.download.ArtworkStore
 import com.subtracks.data.download.FakeDownloadEngine
@@ -14,9 +16,11 @@ import com.subtracks.data.repo.DownloadRepository
 import com.subtracks.data.repo.QueueRepository
 import com.subtracks.data.repo.SourceRepository
 import com.subtracks.data.sync.SyncManager
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.asCoroutineDispatcher
 import kotlinx.coroutines.cancelAndJoin
 import kotlinx.coroutines.runBlocking
@@ -45,8 +49,8 @@ class AddSourceViewModelTest {
     private lateinit var sourceRepository: SourceRepository
     private lateinit var downloadRepository: DownloadRepository
     private lateinit var server: MockWebServer
+    private val repoScope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
     private val createdViewModels = mutableListOf<AddSourceViewModel>()
-    private val syncManagers = mutableListOf<SyncManager>()
 
     @Before
     fun setUp() {
@@ -58,7 +62,7 @@ class AddSourceViewModelTest {
                 .setDriver(BundledSQLiteDriver())
                 .build()
         val artwork = ArtworkStore(File(context.cacheDir, "art-${System.nanoTime()}"))
-        sourceRepository = SourceRepository(db, OkHttpClient(), fakeUserPreferences(), artwork)
+        sourceRepository = SourceRepository(db, OkHttpClient(), fakeUserPreferences(), artwork, scope = repoScope)
         downloadRepository =
             DownloadRepository(
                 db,
@@ -67,6 +71,7 @@ class AddSourceViewModelTest {
                 File(context.cacheDir, "downloads-${System.nanoTime()}"),
                 artworkStore = artwork,
                 artworkFetcher = { ByteArray(0) },
+                scope = repoScope,
             )
         server = MockWebServer()
         server.start()
@@ -75,10 +80,8 @@ class AddSourceViewModelTest {
     @After
     fun tearDown() {
         createdViewModels.forEach { runBlocking { it.viewModelScope.coroutineContext[Job]?.cancelAndJoin() } }
-        syncManagers.forEach { it.close() }
+        cancelAndJoinBlocking(repoScope)
         server.shutdown()
-        downloadRepository.close()
-        sourceRepository.close()
         db.close()
         Dispatchers.resetMain()
         dispatcher.close()
@@ -137,7 +140,7 @@ class AddSourceViewModelTest {
         }
 
     private fun viewModel(sourceId: Long? = null): AddSourceViewModel {
-        val syncManager = SyncManager(db, sourceRepository, QueueRepository(db)).also { syncManagers += it }
+        val syncManager = SyncManager(db, sourceRepository, QueueRepository(db), scope = repoScope)
         return AddSourceViewModel(sourceRepository, syncManager, downloadRepository, sourceId).also { createdViewModels += it }
     }
 
@@ -149,8 +152,8 @@ class AddSourceViewModelTest {
         )
 
     private fun await(predicate: () -> Boolean) {
-        val deadline = System.nanoTime() + 5_000_000_000L
+        val deadline = System.nanoTime() + TEST_TIMEOUT_MS * 1_000_000
         while (!predicate() && System.nanoTime() < deadline) Thread.sleep(10)
-        assertTrue("Timed out waiting for the expected state", predicate())
+        assertTrue("Timed out after ${TEST_TIMEOUT_MS}ms waiting for the expected state", predicate())
     }
 }