Do not fail un-registration if Firebase token is not known. Fixes #2895

libraries/pushproviders/firebase/src/main/kotlin/io/element/android/libraries/pushproviders/firebase/FirebasePushProvider.kt

@@ -64,14 +64,13 @@ class FirebasePushProvider @Inject constructor(
     override suspend fun getCurrentDistributor(matrixClient: MatrixClient) = firebaseDistributor
 
     override suspend fun unregister(matrixClient: MatrixClient): Result<Unit> {
-        val pushKey = firebaseStore.getFcmToken() ?: return Result.failure<Unit>(
-            IllegalStateException(
-                "Unable to unregister pusher, Firebase token is not known."
-            )
-        ).also {
+        val pushKey = firebaseStore.getFcmToken()
+        return if (pushKey == null) {
             Timber.tag(loggerTag.value).w("Unable to unregister pusher, Firebase token is not known.")
+            Result.success(Unit)
+        } else {
+            pusherSubscriber.unregisterPusher(matrixClient, pushKey, FirebaseConfig.PUSHER_HTTP_URL)
         }
-        return pusherSubscriber.unregisterPusher(matrixClient, pushKey, FirebaseConfig.PUSHER_HTTP_URL)
     }
 
     override suspend fun getCurrentUserPushConfig(): CurrentUserPushConfig? {

libraries/pushproviders/firebase/src/test/kotlin/io/element/android/libraries/pushproviders/firebase/FirebasePushProviderTest.kt

@@ -134,17 +134,14 @@ class FirebasePushProviderTest {
     }
 
     @Test
-    fun `unregister ko no token`() = runTest {
+    fun `unregister no token - in this case, the error is ignored`() = runTest {
         val firebasePushProvider = createFirebasePushProvider(
             firebaseStore = InMemoryFirebaseStore(
                 token = null
             ),
-            pusherSubscriber = FakePusherSubscriber(
-                unregisterPusherResult = { _, _, _ -> Result.success(Unit) }
-            )
         )
         val result = firebasePushProvider.unregister(FakeMatrixClient())
-        assertThat(result.isFailure).isTrue()
+        assertThat(result.isSuccess).isTrue()
     }
 
     @Test