chore: minor fix, add test

Signed-off-by: xsahil03x <[email protected]>

packages/stream_chat_persistence/lib/src/stream_chat_persistence_client.dart

@@ -272,17 +272,14 @@ class StreamChatPersistenceClient extends ChatPersistenceClient {
       channels.map((e) => getChannelStateByCid(e.cid)),
     );
 
-    // Only sort the channel states if the channels are not already sorted.
-    if (channelStateSort == null) {
+    // Sort the channel states
     var comparator = _defaultChannelStateComparator;
     if (channelStateSort != null && channelStateSort.isNotEmpty) {
       comparator = _combineComparators(
         channelStateSort.map((it) => it.comparator).withNullifyer,
       );
     }
-
     channelStates.sort(comparator);
-    }
 
     final offset = paginationParams?.offset;
     if (offset != null && offset > 0 && channelStates.isNotEmpty) {

packages/stream_chat_persistence/test/stream_chat_persistence_client_test.dart

@@ -245,7 +245,22 @@ void main() {
           .called(1);
     });
 
-    test('getChannelStates', () async {
+    group('getChannelState', () {
+      test('should throw if sort is provided without comparator', () async {
+        final sort = [
+          const SortOption<ChannelState>(
+            'testField',
+            direction: SortOption.ASC,
+          ),
+        ];
+
+        expect(
+          () => client.getChannelStates(channelStateSort: sort),
+          throwsA(isA<ArgumentError>()),
+        );
+      });
+
+      test('should work fine', () async {
         const cid = 'testType:testId';
         final channels = List.generate(3, (index) => ChannelModel(cid: cid));
         final messages = List.generate(3, (index) => Message());
@@ -291,7 +306,8 @@ void main() {
           final fetched = fetchedChannelStates[i];
           expect(fetched.members?.length, original.members?.length);
           expect(fetched.messages?.length, original.messages?.length);
-        expect(fetched.pinnedMessages?.length, original.pinnedMessages?.length);
+          expect(
+              fetched.pinnedMessages?.length, original.pinnedMessages?.length);
           expect(fetched.read?.length, original.read?.length);
           expect(fetched.channel!.cid, original.channel!.cid);
         }
@@ -304,6 +320,7 @@ void main() {
         verify(() => mockDatabase.pinnedMessageDao.getMessagesByCid(cid))
             .called(3);
       });
+    });
 
     test('updateChannelQueries', () async {
       final filter = Filter.in_('members', const ['testUserId']);