diff --git a/tools/chatgui-android/router-tests/src/test/kotlin/com/utun/chat/data/CallAudioRouterCleanupTest.kt b/tools/chatgui-android/router-tests/src/test/kotlin/com/utun/chat/data/CallAudioRouterCleanupTest.kt
index 6cd992e5..edaf1c85 100644
--- a/tools/chatgui-android/router-tests/src/test/kotlin/com/utun/chat/data/CallAudioRouterCleanupTest.kt
+++ b/tools/chatgui-android/router-tests/src/test/kotlin/com/utun/chat/data/CallAudioRouterCleanupTest.kt
@@ -187,4 +187,31 @@ class CallAudioRouterCleanupTest {
         val clears = operation("clear")
         router.stop(); assertEquals(clears, operation("clear")); assertFalse(router.cleanupPending)
     }
+
+    @Test fun communicationSelectionFailureAfterItsEffectRollsBackTheOwnedDevice() {
+        audio.failures = setOf("select after=1", "clear")
+        assertThrows(IllegalStateException::class.java) { router.start() }
+        assertNotNull(audio.communicationDevice); assertTrue(router.cleanupPending); assertTrue(audio.callbacks.isEmpty())
+        audio.failures = emptySet(); router.stop()
+        assertNull(audio.communicationDevice); assertFalse(router.cleanupPending)
+    }
+
+    @Test fun communicationReleaseAfterEffectStillNeedsASuccessfulAcknowledgment() {
+        router.start(); adapter.connect(0)
+        audio.failures = setOf("clear after"); stopRejected()
+        assertNull(audio.communicationDevice); assertTrue(router.cleanupPending)
+        audio.failures = emptySet(); router.stop()
+        assertFalse(router.cleanupPending); assertEquals(2, operation("clear"))
+    }
+
+    @Test fun legacyScoEffectsAndIndependentAcknowledgmentsSurviveAfterEffectFailures() {
+        Build.VERSION.SDK_INT = 30
+        router.start(); adapter.connect(0)
+        audio.failures = setOf("start sco after"); router.setRoute(AudioRoute.HEADSET)
+        assertTrue(audio.legacyScoStarted)
+        audio.failures = setOf("stop sco after", "sco after=false"); stopRejected()
+        assertFalse(audio.legacyScoStarted); assertFalse(audio.isBluetoothScoOn); assertTrue(router.cleanupPending)
+        audio.failures = emptySet(); router.stop()
+        assertFalse(router.cleanupPending); assertEquals(2, operation("stop sco")); assertEquals(2, operation("sco=false"))
+    }
 }