cancel in-flight downloads when offline mode turns on

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

@@ -76,6 +76,11 @@ class DownloadRepository(
         scope.launch {
             sourceRepository.activeSourceId().distinctUntilChanged().collect { reconcile() }
         }
+        scope.launch {
+            sourceRepository.offline.collect { offline ->
+                if (offline) cancelActive()
+            }
+        }
     }
 
     fun close() {

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

@@ -345,6 +345,23 @@ class DownloadRepositoryTest {
             assertNotNull(artwork.uri(1, coverArtKey(1, PLAYLIST_ART, false)))
         }
 
+    @Test
+    fun goingOfflineCancelsActiveDownloads() =
+        runTest {
+            seedLibrary()
+            repository.start()
+            val active: (SongDownload) -> Boolean = {
+                it.status == DownloadStatus.Queued || it.status == DownloadStatus.Running
+            }
+            runBlocking { repository.download(1, "s1") }
+            await { allRows().any(active) }
+
+            runBlocking { sources.setOfflineMode(true) }
+
+            await { allRows().none(active) }
+            assertTrue(engine.cancelled.isNotEmpty())
+        }
+
     @Test
     fun theDownloadStartsBeforeItsArtworkIsFetched() =
         runTest {