[bugfix] TF-2316 Can not delete folder when its children are hidden (#2519)

lib/features/mailbox/domain/usecases/delete_multiple_mailbox_interactor.dart

@@ -1,3 +1,4 @@
+import 'dart:collection';
 import 'package:core/presentation/state/failure.dart';
 import 'package:core/presentation/state/success.dart';
 import 'package:core/utils/app_logger.dart';
@@ -5,6 +6,8 @@ import 'package:dartz/dartz.dart';
 import 'package:jmap_dart_client/jmap/account_id.dart';
 import 'package:jmap_dart_client/jmap/core/session/session.dart';
 import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
+import 'package:model/extensions/mailbox_extension.dart';
+import 'package:model/mailbox/presentation_mailbox.dart';
 import 'package:tmail_ui_user/features/mailbox/domain/repository/mailbox_repository.dart';
 import 'package:tmail_ui_user/features/mailbox/domain/state/delete_multiple_mailbox_state.dart';
 
@@ -14,24 +17,40 @@ class DeleteMultipleMailboxInteractor {
   DeleteMultipleMailboxInteractor(this._mailboxRepository);
 
   Stream<Either<Failure, Success>> execute(
-      Session session,
-      AccountId accountId,
-      Map<MailboxId, List<MailboxId>> mapMailboxIdToDelete,
-      List<MailboxId> listMailboxIdToDelete
+    Session session,
+    AccountId accountId,
+    List<MailboxId> selectedMailboxIds,
   ) async* {
     try {
       yield Right<Failure, Success>(LoadingDeleteMultipleMailboxAll());
 
       final currentMailboxState = await _mailboxRepository.getMailboxState(session, accountId);
 
+      final mailboxResponses = await _mailboxRepository.getAllMailbox(session, accountId).toList();
+
+      final Set<MailboxId> seenIds = {};
+      final List<PresentationMailbox> allMailboxes = [];
+      for (final response in mailboxResponses) {
+        for (final mailbox in response.mailboxes) {
+          final presentation = mailbox.toPresentationMailbox();
+          if (seenIds.add(presentation.id)) {
+            allMailboxes.add(presentation);
+          }
+        }
+      }
+
+      final deleteMap = _buildDeleteMap(selectedMailboxIds, allMailboxes);
+      final mapMailboxIdToDelete = deleteMap.value1;
+      final listMailboxIdToDelete = deleteMap.value2;
+
       final listResult = await Future.wait(
-          mapMailboxIdToDelete.keys.map((mailboxId) {
-            final mailboxIdsToDelete = mapMailboxIdToDelete[mailboxId]!;
-            return _mailboxRepository.deleteMultipleMailbox(
-                session,
-                accountId,
-                mailboxIdsToDelete);
-          })
+        mapMailboxIdToDelete.keys.map((mailboxId) {
+          return _mailboxRepository.deleteMultipleMailbox(
+            session,
+            accountId,
+            mapMailboxIdToDelete[mailboxId]!,
+          );
+        }),
       );
 
       final allSuccess = listResult.every((result) => result.isEmpty);
@@ -39,18 +58,85 @@ class DeleteMultipleMailboxInteractor {
 
       if (allSuccess) {
         yield Right<Failure, Success>(DeleteMultipleMailboxAllSuccess(
-            listMailboxIdToDelete,
-            currentMailboxState: currentMailboxState));
+          listMailboxIdToDelete,
+          currentMailboxState: currentMailboxState,
+        ));
       } else if (allFailed) {
         yield Left<Failure, Success>(DeleteMultipleMailboxAllFailure());
       } else {
         yield Right<Failure, Success>(DeleteMultipleMailboxHasSomeSuccess(
-            listMailboxIdToDelete,
-            currentMailboxState: currentMailboxState));
+          listMailboxIdToDelete,
+          currentMailboxState: currentMailboxState,
+        ));
       }
     } catch (e) {
       logWarning('DeleteMultipleMailboxInteractor::execute(): exception: $e');
       yield Left<Failure, Success>(DeleteMultipleMailboxFailure(e));
     }
   }
-}
+
+  /// Builds the map of [MailboxId] → ordered delete list for each selected root,
+  /// plus a flat list of all IDs to delete.
+  ///
+  /// Uses [allMailboxes] (subscribed and unsubscribed) so hidden subfolders are
+  /// automatically included — no separate unsubscribed-tree pass is needed.
+  Tuple2<Map<MailboxId, List<MailboxId>>, List<MailboxId>> _buildDeleteMap(
+    List<MailboxId> selectedMailboxIds,
+    List<PresentationMailbox> allMailboxes,
+  ) {
+    final parentToChildren = _buildParentToChildrenMap(allMailboxes);
+    final Map<MailboxId, List<MailboxId>> mapDescendantIds = {};
+    final Set<MailboxId> processedIds = {};
+
+    for (final mailboxId in selectedMailboxIds) {
+      if (processedIds.contains(mailboxId)) continue;
+
+      // Collect all descendants (pre-order DFS), then reverse so deepest children
+      // come first — the server requires children to be deleted before parents.
+      final descendants = _collectDescendantsPreOrder(mailboxId, parentToChildren);
+      final deleteOrder = descendants.reversed.toList();
+
+      mapDescendantIds[mailboxId] = deleteOrder;
+      processedIds.addAll(deleteOrder);
+    }
+
+    final allMailboxIds = mapDescendantIds.values.expand((ids) => ids).toList();
+    return Tuple2(mapDescendantIds, allMailboxIds);
+  }
+
+  Map<MailboxId, List<MailboxId>> _buildParentToChildrenMap(
+    List<PresentationMailbox> mailboxes,
+  ) {
+    final Map<MailboxId, List<MailboxId>> parentToChildren = HashMap();
+    for (final mailbox in mailboxes) {
+      final parentId = mailbox.parentId;
+      if (parentId != null) {
+        parentToChildren.putIfAbsent(parentId, () => []).add(mailbox.id);
+      }
+    }
+    return parentToChildren;
+  }
+
+  /// Pre-order DFS: root first, then children. Caller should reverse the result
+  /// to get deepest-first deletion order.
+  List<MailboxId> _collectDescendantsPreOrder(
+    MailboxId rootId,
+    Map<MailboxId, List<MailboxId>> parentToChildren,
+  ) {
+    final result = <MailboxId>[];
+    final stack = ListQueue<MailboxId>()..addLast(rootId);
+
+    while (stack.isNotEmpty) {
+      final current = stack.removeLast();
+      result.add(current);
+      final children = parentToChildren[current];
+      if (children != null) {
+        // Push in reverse so the first child is processed first (stack is LIFO).
+        for (final child in children.reversed) {
+          stack.addLast(child);
+        }
+      }
+    }
+    return result;
+  }
+}

lib/features/mailbox/presentation/mailbox_controller.dart

@@ -79,7 +79,6 @@ import 'package:tmail_ui_user/features/mailbox/presentation/model/mailbox_node.d
 import 'package:tmail_ui_user/features/mailbox/presentation/model/mailbox_tree_builder.dart';
 import 'package:tmail_ui_user/features/mailbox/presentation/model/open_mailbox_view_event.dart';
 import 'package:tmail_ui_user/features/mailbox/presentation/utils/mailbox_action_reactor.dart';
-import 'package:tmail_ui_user/features/mailbox/presentation/utils/mailbox_utils.dart';
 import 'package:tmail_ui_user/features/mailbox_creator/domain/usecases/verify_name_interactor.dart';
 import 'package:tmail_ui_user/features/mailbox_creator/presentation/model/mailbox_creator_arguments.dart';
 import 'package:tmail_ui_user/features/mailbox_creator/presentation/model/new_mailbox_arguments.dart';
@@ -565,7 +564,7 @@ class MailboxController extends BaseMailboxController
       consumeState(Stream.value(Left(GetAllMailboxFailure(NotFoundSessionException()))));
     }
   }
-  
+
   void _refreshMailboxChanges({required jmap.State newState}) {
     log('MailboxController::_refreshMailboxChanges():newState: $newState');
     if (accountId == null ||
@@ -1039,18 +1038,10 @@ class MailboxController extends BaseMailboxController
 
   void _deleteMailboxAction(PresentationMailbox presentationMailbox) {
     if (session != null && accountId != null) {
-      final tupleMap = MailboxUtils.generateMapDescendantIdsAndMailboxIdList(
-          [presentationMailbox],
-          defaultMailboxTree.value,
-          personalMailboxTree.value);
-      final mapDescendantIds = tupleMap.value1;
-      final listMailboxId = tupleMap.value2;
-
       consumeState(_deleteMultipleMailboxInteractor.execute(
         session!,
         accountId!,
-        mapDescendantIds,
-        listMailboxId,
+        [presentationMailbox.id],
       ));
     } else {
       _deleteMailboxFailure(DeleteMultipleMailboxFailure(null));

lib/features/mailbox/presentation/utils/mailbox_utils.dart

@@ -1,60 +1,9 @@
-import 'package:core/presentation/utils/responsive_utils.dart';
-import 'package:core/utils/app_logger.dart';
-import 'package:dartz/dartz.dart';
 import 'package:email_recovery/email_recovery/capability_deleted_messages_vault.dart';
-import 'package:flutter/material.dart';
 import 'package:jmap_dart_client/jmap/account_id.dart';
 import 'package:jmap_dart_client/jmap/core/session/session.dart';
-import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
-import 'package:model/mailbox/presentation_mailbox.dart';
-import 'package:tmail_ui_user/features/mailbox/presentation/extensions/list_mailbox_node_extension.dart';
-import 'package:tmail_ui_user/features/mailbox/presentation/model/mailbox_tree.dart';
 import 'package:tmail_ui_user/main/error/capability_validator.dart';
 
 class MailboxUtils {
-
-  static Tuple2<Map<MailboxId, List<MailboxId>>, List<MailboxId>> generateMapDescendantIdsAndMailboxIdList(
-      List<PresentationMailbox> selectedMailboxList,
-      MailboxTree defaultMailboxTree,
-      MailboxTree folderMailboxTree,
-  ) {
-    Map<MailboxId, List<MailboxId>> mapDescendantIds = {};
-    List<MailboxId> allMailboxIds = [];
-
-    for (var mailbox in selectedMailboxList) {
-      final currentMailboxId = mailbox.id;
-
-      if (allMailboxIds.contains(currentMailboxId)) {
-        continue;
-      } else {
-        final matchedNode = defaultMailboxTree.findNode((node) => node.item.id == currentMailboxId)
-            ?? folderMailboxTree.findNode((node) => node.item.id == currentMailboxId);
-
-        if (matchedNode != null)  {
-          final descendantIds = matchedNode.descendantsAsList().mailboxIds;
-          final descendantIdsReversed = descendantIds.reversed.toList();
-
-          mapDescendantIds[currentMailboxId] = descendantIdsReversed;
-          allMailboxIds.addAll(descendantIdsReversed);
-        }
-      }
-    }
-    log('MailboxUtils::generateMapDescendantIdsAndMailboxIdList(): mapDescendantIds: $mapDescendantIds');
-    return Tuple2(mapDescendantIds, allMailboxIds);
-  }
-
-  static EdgeInsets getPaddingListViewMailboxSearched(BuildContext context, ResponsiveUtils responsiveUtils) {
-    if (responsiveUtils.isWebDesktop(context)) {
-      return const EdgeInsets.only(left: 16, right: 16, bottom: 16);
-    } else {
-      if (responsiveUtils.isScreenWithShortestSide(context)) {
-        return const EdgeInsets.all(16);
-      } else {
-        return const EdgeInsets.symmetric(horizontal: 32, vertical: 16);
-      }
-    }
-  }
-
   static bool isDeletedMessageVaultSupported(Session? session, AccountId? accountId) {
     if (session == null || accountId == null) {
       return false;

lib/features/search/mailbox/presentation/search_mailbox_controller.dart

@@ -63,7 +63,6 @@ import 'package:tmail_ui_user/features/mailbox/presentation/extensions/presentat
 import 'package:tmail_ui_user/features/mailbox/presentation/model/mailbox_actions.dart';
 import 'package:tmail_ui_user/features/mailbox/presentation/model/mailbox_tree_builder.dart';
 import 'package:tmail_ui_user/features/mailbox/presentation/utils/mailbox_action_reactor.dart';
-import 'package:tmail_ui_user/features/mailbox/presentation/utils/mailbox_utils.dart';
 import 'package:tmail_ui_user/features/mailbox_creator/domain/usecases/verify_name_interactor.dart';
 import 'package:tmail_ui_user/features/mailbox_creator/presentation/model/mailbox_creator_arguments.dart';
 import 'package:tmail_ui_user/features/mailbox_creator/presentation/model/new_mailbox_arguments.dart';
@@ -584,19 +583,10 @@ class SearchMailboxController extends BaseMailboxController with MailboxActionHa
 
   void _deleteMailboxAction(PresentationMailbox presentationMailbox) {
     if (session != null && accountId != null) {
-      final tupleMap = MailboxUtils.generateMapDescendantIdsAndMailboxIdList(
-        [presentationMailbox],
-        defaultMailboxTree.value,
-        personalMailboxTree.value
-      );
-      final mapDescendantIds = tupleMap.value1;
-      final listMailboxId = tupleMap.value2;
-
       consumeState(_deleteMultipleMailboxInteractor.execute(
         session!,
         accountId!,
-        mapDescendantIds,
-        listMailboxId
+        [presentationMailbox.id],
       ));
     } else {
       _deleteMailboxFailure(DeleteMultipleMailboxFailure(null));

test/features/mailbox/domain/usecases/delete_multiple_mailbox_interactor_test.dart

@@ -0,0 +1,277 @@
+import 'package:dartz/dartz.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jmap_dart_client/jmap/core/error/error_type.dart';
+import 'package:jmap_dart_client/jmap/core/error/set_error.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+import 'package:tmail_ui_user/features/mailbox/domain/model/jmap_mailbox_response.dart';
+import 'package:tmail_ui_user/features/mailbox/domain/repository/mailbox_repository.dart';
+import 'package:jmap_dart_client/jmap/core/state.dart' as jmap;
+import 'package:tmail_ui_user/features/mailbox/domain/state/delete_multiple_mailbox_state.dart';
+import 'package:tmail_ui_user/features/mailbox/domain/usecases/delete_multiple_mailbox_interactor.dart';
+import '../../../../fixtures/account_fixtures.dart';
+import '../../../../fixtures/mailbox_fixtures.dart';
+import '../../../../fixtures/session_fixtures.dart';
+import 'delete_multiple_mailbox_interactor_test.mocks.dart';
+
+@GenerateMocks([MailboxRepository])
+
+void _stubGetMailboxState(MailboxRepository repo, jmap.State state) {
+  when(
+    repo.getMailboxState(SessionFixtures.aliceSession, AccountFixtures.aliceAccountId),
+  ).thenAnswer((_) => Future.value(state));
+}
+
+void _stubGetAllMailboxWithHiddenMailboxes(MailboxRepository repo, jmap.State state) {
+  when(
+    repo.getAllMailbox(SessionFixtures.aliceSession, AccountFixtures.aliceAccountId),
+  ).thenAnswer((_) => Stream.fromIterable({
+    JmapMailboxResponse(
+      mailboxes: [
+        MailboxFixtures.inboxMailbox,
+        MailboxFixtures.sentMailbox,
+        MailboxFixtures.selectedFolderToDelete,
+        MailboxFixtures.selectedFolderToDelete_1,
+        MailboxFixtures.selectedFolderToDelete_2,
+      ],
+      state: state,
+    ),
+    JmapMailboxResponse(
+      mailboxes: [
+        MailboxFixtures.inboxMailbox,
+        MailboxFixtures.sentMailbox,
+        MailboxFixtures.selectedFolderToDelete,
+        MailboxFixtures.selectedFolderToDelete_1,
+        MailboxFixtures.selectedFolderToDelete_2,
+        MailboxFixtures.selectedFolderToDelete_3,
+        MailboxFixtures.selectedFolderToDelete_4,
+        MailboxFixtures.selectedFolderToDelete_5,
+        MailboxFixtures.selectedFolderToDelete_6,
+        MailboxFixtures.selectedFolderToDelete_7,
+        MailboxFixtures.selectedFolderToDelete_8,
+        MailboxFixtures.selectedFolderToDelete_9,
+        MailboxFixtures.selectedFolderToDelete_10,
+      ],
+      state: state,
+    ),
+  }));
+}
+
+void _stubGetAllMailboxWithSubscribedFolders(MailboxRepository repo, jmap.State state) {
+  when(
+    repo.getAllMailbox(SessionFixtures.aliceSession, AccountFixtures.aliceAccountId),
+  ).thenAnswer((_) => Stream.value(JmapMailboxResponse(
+    mailboxes: [MailboxFixtures.subscribedFolder, MailboxFixtures.subscribedChild],
+    state: state,
+  )));
+}
+
+void _stubDeleteMailboxSuccess(MailboxRepository repo, List<MailboxId> ids) {
+  when(
+    repo.deleteMultipleMailbox(SessionFixtures.aliceSession, AccountFixtures.aliceAccountId, ids),
+  ).thenAnswer((_) => Future.value({}));
+}
+
+void _stubDeleteMailboxFailure(
+  MailboxRepository repo,
+  List<MailboxId> ids,
+  Map<Id, SetError> errors,
+) {
+  when(
+    repo.deleteMultipleMailbox(SessionFixtures.aliceSession, AccountFixtures.aliceAccountId, ids),
+  ).thenAnswer((_) => Future.value(errors));
+}
+
+Stream<dynamic> _executeDelete(
+  DeleteMultipleMailboxInteractor interactor,
+  List<MailboxId> ids,
+) => interactor.execute(SessionFixtures.aliceSession, AccountFixtures.aliceAccountId, ids);
+
+Matcher _emitsLoadingThen(dynamic result) => emitsInOrder([
+  Right(LoadingDeleteMultipleMailboxAll()),
+  result,
+]);
+
+void main() {
+  late MailboxRepository mailboxRepository;
+  late DeleteMultipleMailboxInteractor deleteMultipleMailboxInteractor;
+
+  group('[DeleteMultipleMailboxInteractor]', () {
+    setUp(() {
+      mailboxRepository = MockMailboxRepository();
+      deleteMultipleMailboxInteractor = DeleteMultipleMailboxInteractor(mailboxRepository);
+    });
+
+    group('with hidden mailbox responses', () {
+      final state = jmap.State('s1');
+
+      setUp(() {
+        _stubGetMailboxState(mailboxRepository, state);
+        _stubGetAllMailboxWithHiddenMailboxes(mailboxRepository, state);
+        // second batch defaults to success; override per-test when needed
+        _stubDeleteMailboxSuccess(mailboxRepository, MailboxFixtures.listDescendantMailboxForSelectedFolder2);
+      });
+
+      test('Should execute to delete selected mailbox an all its children included hidden mailbox', () {
+        _stubDeleteMailboxSuccess(mailboxRepository, MailboxFixtures.listDescendantMailboxForSelectedFolder);
+
+        expect(
+          _executeDelete(deleteMultipleMailboxInteractor, MailboxFixtures.listMailboxIdsToDelete),
+          _emitsLoadingThen(Right(DeleteMultipleMailboxAllSuccess(
+            MailboxFixtures.listMailboxIdToDelete,
+            currentMailboxState: state,
+          ))),
+        );
+      });
+
+      test('Should execute and yield DeleteMultipleMailboxAllFailure when delete selected mailbox all fail', () {
+        _stubDeleteMailboxFailure(
+          mailboxRepository,
+          MailboxFixtures.listDescendantMailboxForSelectedFolder,
+          {Id('folderToDelete'): SetError(ErrorType('error'))},
+        );
+        _stubDeleteMailboxFailure(
+          mailboxRepository,
+          MailboxFixtures.listDescendantMailboxForSelectedFolder2,
+          {Id('folderToDelete_8'): SetError(ErrorType('error'))},
+        );
+
+        expect(
+          _executeDelete(deleteMultipleMailboxInteractor, MailboxFixtures.listMailboxIdsToDelete),
+          _emitsLoadingThen(Left(DeleteMultipleMailboxAllFailure())),
+        );
+      });
+
+      test('Should execute and yield DeleteMultipleMailboxHasSomeSuccess when delete selected mailbox has some fail', () {
+        _stubDeleteMailboxFailure(
+          mailboxRepository,
+          MailboxFixtures.listDescendantMailboxForSelectedFolder,
+          {Id('folderToDelete'): SetError(ErrorType('error'))},
+        );
+
+        expect(
+          _executeDelete(deleteMultipleMailboxInteractor, MailboxFixtures.listMailboxIdsToDelete),
+          _emitsLoadingThen(Right(DeleteMultipleMailboxHasSomeSuccess(
+            MailboxFixtures.listMailboxIdToDelete,
+            currentMailboxState: state,
+          ))),
+        );
+      });
+    });
+
+    test('Should yield AllSuccess with empty lists when selectedMailboxIds is empty', () {
+      final state = jmap.State('s1');
+      _stubGetMailboxState(mailboxRepository, state);
+      when(
+        mailboxRepository.getAllMailbox(SessionFixtures.aliceSession, AccountFixtures.aliceAccountId),
+      ).thenAnswer((_) => Stream.value(JmapMailboxResponse(
+        mailboxes: [MailboxFixtures.inboxMailbox, MailboxFixtures.sentMailbox],
+        state: state,
+      )));
+
+      expect(
+        _executeDelete(deleteMultipleMailboxInteractor, []),
+        _emitsLoadingThen(Right(DeleteMultipleMailboxAllSuccess(
+          [],
+          currentMailboxState: state,
+        ))),
+      );
+    });
+
+    test('Should execute and yield DeleteMultipleMailboxFailure when getAllMailbox fail', () {
+      final state = jmap.State('s1');
+      _stubGetMailboxState(mailboxRepository, state);
+      when(
+        mailboxRepository.getAllMailbox(SessionFixtures.aliceSession, AccountFixtures.aliceAccountId),
+      ).thenThrow('error');
+
+      expect(
+        _executeDelete(deleteMultipleMailboxInteractor, MailboxFixtures.listMailboxIdsToDelete),
+        _emitsLoadingThen(Left(DeleteMultipleMailboxFailure('error'))),
+      );
+    });
+
+    test('Should delete selected mailbox alone when it is absent from allMailboxes (no children found)', () {
+      final state = jmap.State('s1');
+      final ghostMailboxId = MailboxId(Id('ghostMailbox'));
+      _stubGetMailboxState(mailboxRepository, state);
+      when(
+        mailboxRepository.getAllMailbox(SessionFixtures.aliceSession, AccountFixtures.aliceAccountId),
+      ).thenAnswer((_) => Stream.value(JmapMailboxResponse(
+        mailboxes: [MailboxFixtures.inboxMailbox, MailboxFixtures.sentMailbox],
+        state: state,
+      )));
+      _stubDeleteMailboxSuccess(mailboxRepository, [ghostMailboxId]);
+
+      expect(
+        _executeDelete(deleteMultipleMailboxInteractor, [ghostMailboxId]),
+        _emitsLoadingThen(Right(DeleteMultipleMailboxAllSuccess(
+          [ghostMailboxId],
+          currentMailboxState: state,
+        ))),
+      );
+    });
+
+    group('with subscribed folders', () {
+      final state = jmap.State('s1');
+
+      setUp(() {
+        _stubGetMailboxState(mailboxRepository, state);
+        _stubGetAllMailboxWithSubscribedFolders(mailboxRepository, state);
+        _stubDeleteMailboxSuccess(mailboxRepository, MailboxFixtures.expectedDeleteListSubscribedOnly);
+      });
+
+      test('Should delete subscribed child before parent when no hidden subfolders exist', () {
+        expect(
+          _executeDelete(deleteMultipleMailboxInteractor, MailboxFixtures.listMailboxIdsForSubscribedOnly),
+          _emitsLoadingThen(Right(DeleteMultipleMailboxAllSuccess(
+            MailboxFixtures.expectedDeleteListSubscribedOnly,
+            currentMailboxState: state,
+          ))),
+        );
+      });
+
+      test('Should skip already-processed descendant when it also appears in selectedMailboxIds', () {
+        // subscribedChild is a descendant of subscribedFolder — it must be skipped
+        // as a root and subsumed into the parent's batch instead.
+        expect(
+          _executeDelete(deleteMultipleMailboxInteractor, [
+            MailboxFixtures.subscribedFolder.id!,
+            MailboxFixtures.subscribedChild.id!,
+          ]),
+          _emitsLoadingThen(Right(DeleteMultipleMailboxAllSuccess(
+            MailboxFixtures.expectedDeleteListSubscribedOnly,
+            currentMailboxState: state,
+          ))),
+        );
+      });
+    });
+
+    test('Should delete 3-level unsubscribed nesting in deepest-first order', () {
+      final state = jmap.State('s1');
+      _stubGetMailboxState(mailboxRepository, state);
+      when(
+        mailboxRepository.getAllMailbox(SessionFixtures.aliceSession, AccountFixtures.aliceAccountId),
+      ).thenAnswer((_) => Stream.value(JmapMailboxResponse(
+        mailboxes: [
+          MailboxFixtures.parentFolder,
+          MailboxFixtures.hiddenLevel1,
+          MailboxFixtures.hiddenLevel2,
+          MailboxFixtures.hiddenLevel3,
+        ],
+        state: state,
+      )));
+      _stubDeleteMailboxSuccess(mailboxRepository, MailboxFixtures.expectedDeleteListThreeLevelNesting);
+
+      expect(
+        _executeDelete(deleteMultipleMailboxInteractor, [MailboxFixtures.parentFolder.id!]),
+        _emitsLoadingThen(Right(DeleteMultipleMailboxAllSuccess(
+          MailboxFixtures.expectedDeleteListThreeLevelNesting,
+          currentMailboxState: state,
+        ))),
+      );
+    });
+  });
+}

test/features/mailbox/presentation/utils/generate_mapping_delete_multiple_mailbox_test.dart

@@ -1,282 +0,0 @@
-import 'package:flutter_test/flutter_test.dart';
-import 'package:jmap_dart_client/jmap/core/id.dart';
-import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
-import 'package:model/mailbox/presentation_mailbox.dart';
-import 'package:tmail_ui_user/features/mailbox/presentation/model/mailbox_node.dart';
-import 'package:tmail_ui_user/features/mailbox/presentation/model/mailbox_tree.dart';
-import 'package:tmail_ui_user/features/mailbox/presentation/utils/mailbox_utils.dart';
-
-void main() {
-  group('generate mapping delete multiple mailbox test', () {
-
-    final expectedMapOfTwoMailboxId = {
-      MailboxId(Id("A")): [
-        MailboxId(Id('A_1_1')),
-        MailboxId(Id('A_1')),
-        MailboxId(Id('A_2_1')),
-        MailboxId(Id('A_2')),
-        MailboxId(Id('A'))
-      ],
-      MailboxId(Id("B_1")): [MailboxId(Id('B_1'))],
-    };
-
-    final expectedListMailboxId = [
-      MailboxId(Id('A_1_1')),
-      MailboxId(Id('A_1')),
-      MailboxId(Id('A_2_1')),
-      MailboxId(Id('A_2')),
-      MailboxId(Id('A')),
-      MailboxId(Id('B_1')),
-    ];
-
-    final expectedMapOfOneMailboxId = {
-      MailboxId(Id("A")): [
-        MailboxId(Id('A_1_1')),
-        MailboxId(Id('A_1')),
-        MailboxId(Id('A_2_1')),
-        MailboxId(Id('A_2')),
-        MailboxId(Id('A'))
-      ]
-    };
-
-    final expectedMapOfThreeMailboxId = {
-      MailboxId(Id("A")): [
-        MailboxId(Id('A_1_1')),
-        MailboxId(Id('A_1')),
-        MailboxId(Id('A_2_1')),
-        MailboxId(Id('A_2')),
-        MailboxId(Id('A'))
-      ],
-      MailboxId(Id("B_1")): [MailboxId(Id('B_1'))],
-      MailboxId(Id("C_1")): [MailboxId(Id('C_1'))],
-    };
-
-    test('_generateMapDescendantIdsAndMailboxIdList should return map with 2 items when mailboxes belong to 2 different tree', () async {
-      final defaultMailboxTree = MailboxTree(MailboxNode(PresentationMailbox(MailboxId(Id('root')))));
-
-      final folderMailboxTree = MailboxTree(
-          MailboxNode(
-              PresentationMailbox(MailboxId(Id('root'))),
-              childrenItems: [
-                MailboxNode(
-                    PresentationMailbox(MailboxId(Id('A')), parentId: null),
-                    childrenItems: [
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('A_2')), parentId: MailboxId(Id('A'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('A_2_1')), parentId: MailboxId(Id('A_2'))))
-                          ]
-                      ),
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('A_1')), parentId: MailboxId(Id('A'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('A_1_1')), parentId: MailboxId(Id('A_1'))))
-                          ]
-                      ),
-                    ]
-                ),
-                MailboxNode(
-                    PresentationMailbox(MailboxId(Id('B')), parentId: null),
-                    childrenItems: [
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('B_2')), parentId: MailboxId(Id('B'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('B_2_1')), parentId: MailboxId(Id('B_2'))))
-                          ]
-                      ),
-                      MailboxNode(PresentationMailbox(MailboxId(Id('B_1')), parentId: MailboxId(Id('B')))),
-                    ]
-                )
-              ]
-          )
-      );
-
-      final selectedMailboxList = [
-        PresentationMailbox(MailboxId(Id("A")), parentId: null),
-        PresentationMailbox(MailboxId(Id('A_1')), parentId: MailboxId(Id('A'))),
-        PresentationMailbox(MailboxId(Id('A_2_1')), parentId: MailboxId(Id('A_2'))),
-        PresentationMailbox(MailboxId(Id("B_1")), parentId: MailboxId(Id('B')))
-      ];
-
-      final tupleResult = MailboxUtils.generateMapDescendantIdsAndMailboxIdList(
-          selectedMailboxList,
-          defaultMailboxTree,
-          folderMailboxTree);
-
-      expect(tupleResult.value1, equals(expectedMapOfTwoMailboxId));
-    });
-
-    test('_generateMapDescendantIdsAndMailboxIdList should return list with 5 item when mailboxes belong to 2 different tree', () async {
-      final defaultMailboxTree = MailboxTree(MailboxNode(PresentationMailbox(MailboxId(Id('root')))));
-
-      final folderMailboxTree = MailboxTree(
-          MailboxNode(
-              PresentationMailbox(MailboxId(Id('root'))),
-              childrenItems: [
-                MailboxNode(
-                    PresentationMailbox(MailboxId(Id('A')), parentId: null),
-                    childrenItems: [
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('A_2')), parentId: MailboxId(Id('A'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('A_2_1')), parentId: MailboxId(Id('A_2'))))
-                          ]
-                      ),
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('A_1')), parentId: MailboxId(Id('A'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('A_1_1')), parentId: MailboxId(Id('A_1'))))
-                          ]
-                      ),
-                    ]
-                ),
-                MailboxNode(
-                    PresentationMailbox(MailboxId(Id('B')), parentId: null),
-                    childrenItems: [
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('B_2')), parentId: MailboxId(Id('B'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('B_2_1')), parentId: MailboxId(Id('B_2'))))
-                          ]
-                      ),
-                      MailboxNode(PresentationMailbox(MailboxId(Id('B_1')), parentId: MailboxId(Id('B')))),
-                    ]
-                )
-              ]
-          )
-      );
-
-      final selectedMailboxList = [
-        PresentationMailbox(MailboxId(Id("A")), parentId: null),
-        PresentationMailbox(MailboxId(Id('A_1')), parentId: MailboxId(Id('A'))),
-        PresentationMailbox(MailboxId(Id('A_2_1')), parentId: MailboxId(Id('A_2'))),
-        PresentationMailbox(MailboxId(Id("B_1")), parentId: MailboxId(Id('B')))
-      ];
-
-      final tupleResult = MailboxUtils.generateMapDescendantIdsAndMailboxIdList(
-          selectedMailboxList,
-          defaultMailboxTree,
-          folderMailboxTree);
-
-      expect(tupleResult.value2, equals(expectedListMailboxId));
-    });
-
-    test('_generateMapDescendantIdsAndMailboxIdList should return map with 1 items when mailboxes belong to 2 different tree', () async {
-      final defaultMailboxTree = MailboxTree(MailboxNode(PresentationMailbox(MailboxId(Id('root')))));
-
-      final folderMailboxTree = MailboxTree(
-          MailboxNode(
-              PresentationMailbox(MailboxId(Id('root'))),
-              childrenItems: [
-                MailboxNode(
-                    PresentationMailbox(MailboxId(Id('A')), parentId: null),
-                    childrenItems: [
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('A_2')), parentId: MailboxId(Id('A'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('A_2_1')), parentId: MailboxId(Id('A_2'))))
-                          ]
-                      ),
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('A_1')), parentId: MailboxId(Id('A'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('A_1_1')), parentId: MailboxId(Id('A_1'))))
-                          ]
-                      ),
-                    ]
-                ),
-                MailboxNode(
-                    PresentationMailbox(MailboxId(Id('B')), parentId: null),
-                    childrenItems: [
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('B_2')), parentId: MailboxId(Id('B'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('B_2_1')), parentId: MailboxId(Id('B_2'))))
-                          ]
-                      ),
-                      MailboxNode(PresentationMailbox(MailboxId(Id('B_1')), parentId: MailboxId(Id('B')))),
-                    ]
-                )
-              ]
-          )
-      );
-
-      final selectedMailboxList = [
-        PresentationMailbox(MailboxId(Id("A")), parentId: null),
-      ];
-
-      final tupleResult = MailboxUtils.generateMapDescendantIdsAndMailboxIdList(
-          selectedMailboxList,
-          defaultMailboxTree,
-          folderMailboxTree);
-
-      expect(tupleResult.value1, equals(expectedMapOfOneMailboxId));
-    });
-
-    test('_generateMapDescendantIdsAndMailboxIdList should return map with 3 items when mailboxes belong to 2 different tree', () async {
-      final defaultMailboxTree = MailboxTree(MailboxNode(PresentationMailbox(MailboxId(Id('root')))));
-
-      final folderMailboxTree = MailboxTree(
-          MailboxNode(
-              PresentationMailbox(MailboxId(Id('root'))),
-              childrenItems: [
-                MailboxNode(
-                    PresentationMailbox(MailboxId(Id('A')), parentId: null),
-                    childrenItems: [
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('A_2')), parentId: MailboxId(Id('A'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('A_2_1')), parentId: MailboxId(Id('A_2'))))
-                          ]
-                      ),
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('A_1')), parentId: MailboxId(Id('A'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('A_1_1')), parentId: MailboxId(Id('A_1'))))
-                          ]
-                      ),
-                    ]
-                ),
-                MailboxNode(
-                    PresentationMailbox(MailboxId(Id('B')), parentId: null),
-                    childrenItems: [
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('B_2')), parentId: MailboxId(Id('B'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('B_2_1')), parentId: MailboxId(Id('B_2'))))
-                          ]
-                      ),
-                      MailboxNode(PresentationMailbox(MailboxId(Id('B_1')), parentId: MailboxId(Id('B')))),
-                    ]
-                ),
-                MailboxNode(
-                    PresentationMailbox(MailboxId(Id('C')), parentId: null),
-                    childrenItems: [
-                      MailboxNode(
-                          PresentationMailbox(MailboxId(Id('C_2')), parentId: MailboxId(Id('C'))),
-                          childrenItems: [
-                            MailboxNode(PresentationMailbox(MailboxId(Id('C_2_1')), parentId: MailboxId(Id('C_2'))))
-                          ]
-                      ),
-                      MailboxNode(PresentationMailbox(MailboxId(Id('C_1')), parentId: MailboxId(Id('C')))),
-                    ]
-                )
-              ]
-          )
-      );
-
-      final selectedMailboxList = [
-        PresentationMailbox(MailboxId(Id("A")), parentId: null),
-        PresentationMailbox(MailboxId(Id("B_1")), parentId: MailboxId(Id('B'))),
-        PresentationMailbox(MailboxId(Id("C_1")), parentId: MailboxId(Id('C')))
-      ];
-
-      final tupleResult = MailboxUtils.generateMapDescendantIdsAndMailboxIdList(
-          selectedMailboxList,
-          defaultMailboxTree,
-          folderMailboxTree);
-
-      expect(tupleResult.value1, equals(expectedMapOfThreeMailboxId));
-    });
-  });
-}

test/fixtures/mailbox_fixtures.dart

@@ -107,4 +107,407 @@ class MailboxFixtures {
       PresentationMailbox.actionRequiredFolder;
 
   static final currentState = State('2c9f1b12-b35a-43e6-9af2-0106fb53a943');
+
+  static final selectedFolderToDelete = Mailbox(
+    id: MailboxId(Id('folderToDelete')),
+    name: MailboxName('folderToDelete'),
+    parentId: null,
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(true)
+  );
+
+  static final selectedFolderToDelete_1 = Mailbox(
+    id: MailboxId(Id('folderToDelete_1')),
+    name: MailboxName('folderToDelete_1'),
+    parentId: MailboxId(Id("folderToDelete")),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(false)
+  );
+
+  static final selectedFolderToDelete_2 = Mailbox(
+    id: MailboxId(Id('folderToDelete_2')),
+    name: MailboxName('folderToDelete_2'),
+    parentId: MailboxId(Id("folderToDelete_1")),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(false)
+  );
+
+  static final selectedFolderToDelete_3 = Mailbox(
+    id: MailboxId(Id('folderToDelete_3')),
+    name: MailboxName('folderToDelete_3'),
+    parentId: MailboxId(Id("folderToDelete")),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(true)
+  );
+
+  static final selectedFolderToDelete_4 = Mailbox(
+    id: MailboxId(Id('folderToDelete_4')),
+    name: MailboxName('folderToDelete_4'),
+    parentId: MailboxId(Id("folderToDelete_3")),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(false)
+  );
+
+  static final selectedFolderToDelete_5 = Mailbox(
+    id: MailboxId(Id('folderToDelete_5')),
+    name: MailboxName('folderToDelete_5'),
+    parentId: MailboxId(Id("folderToDelete_3")),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(false)
+  );
+
+  static final selectedFolderToDelete_6 = Mailbox(
+    id: MailboxId(Id('folderToDelete_6')),
+    name: MailboxName('folderToDelete_6'),
+    parentId: MailboxId(Id("folderToDelete_5")),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(false)
+  );
+
+  static final selectedFolderToDelete_7 = Mailbox(
+    id: MailboxId(Id('folderToDelete_7')),
+    name: MailboxName('folderToDelete_7'),
+    parentId: MailboxId(Id("folderToDelete_6")),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(false)
+  );
+
+  static final selectedFolderToDelete_8 = Mailbox(
+    id: MailboxId(Id('folderToDelete_8')),
+    name: MailboxName('folderToDelete_8'),
+    parentId: null,
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(true)
+  );
+
+  static final selectedFolderToDelete_9 = Mailbox(
+    id: MailboxId(Id('folderToDelete_9')),
+    name: MailboxName('folderToDelete_9'),
+    parentId: MailboxId(Id("folderToDelete_8")),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(false)
+  );
+
+  static final selectedFolderToDelete_10 = Mailbox(
+    id: MailboxId(Id('folderToDelete_10')),
+    name: MailboxName('folderToDelete_10'),
+    parentId: MailboxId(Id("folderToDelete_8")),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(123)),
+    unreadEmails: UnreadEmails(UnsignedInt(12)),
+    totalThreads: TotalThreads(UnsignedInt(123)),
+    unreadThreads: UnreadThreads(UnsignedInt(12)),
+    myRights: MailboxRights(
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true
+    ),
+    isSubscribed: IsSubscribed(false)
+  );
+
+  static final listMailboxIdToDelete = [
+    MailboxId(Id('folderToDelete_7')),
+    MailboxId(Id('folderToDelete_6')),
+    MailboxId(Id('folderToDelete_5')),
+    MailboxId(Id('folderToDelete_4')),
+    MailboxId(Id('folderToDelete_3')),
+    MailboxId(Id('folderToDelete_2')),
+    MailboxId(Id('folderToDelete_1')),
+    MailboxId(Id('folderToDelete')),
+    MailboxId(Id('folderToDelete_10')),
+    MailboxId(Id('folderToDelete_9')),
+    MailboxId(Id('folderToDelete_8'))
+  ];
+
+  static final listDescendantMailboxForSelectedFolder = <MailboxId>[
+    MailboxId(Id('folderToDelete_7')),
+    MailboxId(Id('folderToDelete_6')),
+    MailboxId(Id('folderToDelete_5')),
+    MailboxId(Id('folderToDelete_4')),
+    MailboxId(Id('folderToDelete_3')),
+    MailboxId(Id('folderToDelete_2')),
+    MailboxId(Id('folderToDelete_1')),
+    MailboxId(Id('folderToDelete')),
+  ];
+
+  static final listDescendantMailboxForSelectedFolder2 = <MailboxId>[
+    MailboxId(Id('folderToDelete_10')),
+    MailboxId(Id('folderToDelete_9')),
+    MailboxId(Id('folderToDelete_8'))
+  ];
+
+  static final listMailboxIdsToDelete = <MailboxId>[
+    selectedFolderToDelete.id!,
+    selectedFolderToDelete_8.id!,
+  ];
+
+  // Fixtures for "no hidden children" scenario — all mailboxes are subscribed.
+  static final subscribedFolder = Mailbox(
+    id: MailboxId(Id('subscribedFolder')),
+    name: MailboxName('subscribedFolder'),
+    parentId: null,
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(0)),
+    unreadEmails: UnreadEmails(UnsignedInt(0)),
+    totalThreads: TotalThreads(UnsignedInt(0)),
+    unreadThreads: UnreadThreads(UnsignedInt(0)),
+    myRights: MailboxRights(true, true, true, true, true, true, true, true, true),
+    isSubscribed: IsSubscribed(true),
+  );
+
+  static final subscribedChild = Mailbox(
+    id: MailboxId(Id('subscribedChild')),
+    name: MailboxName('subscribedChild'),
+    parentId: MailboxId(Id('subscribedFolder')),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(0)),
+    unreadEmails: UnreadEmails(UnsignedInt(0)),
+    totalThreads: TotalThreads(UnsignedInt(0)),
+    unreadThreads: UnreadThreads(UnsignedInt(0)),
+    myRights: MailboxRights(true, true, true, true, true, true, true, true, true),
+    isSubscribed: IsSubscribed(true),
+  );
+
+  static final listMailboxIdsForSubscribedOnly = <MailboxId>[
+    MailboxId(Id('subscribedFolder')),
+  ];
+
+  static final expectedDeleteListSubscribedOnly = <MailboxId>[
+    MailboxId(Id('subscribedChild')),
+    MailboxId(Id('subscribedFolder')),
+  ];
+
+  // Fixtures for "3-level unsubscribed nesting" scenario.
+  // Tree: parentFolder (subscribed) → level1 (unsubscribed) → level2 (unsubscribed) → level3 (unsubscribed)
+  static final parentFolder = Mailbox(
+    id: MailboxId(Id('parentFolder')),
+    name: MailboxName('parentFolder'),
+    parentId: null,
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(0)),
+    unreadEmails: UnreadEmails(UnsignedInt(0)),
+    totalThreads: TotalThreads(UnsignedInt(0)),
+    unreadThreads: UnreadThreads(UnsignedInt(0)),
+    myRights: MailboxRights(true, true, true, true, true, true, true, true, true),
+    isSubscribed: IsSubscribed(true),
+  );
+
+  static final hiddenLevel1 = Mailbox(
+    id: MailboxId(Id('hiddenLevel1')),
+    name: MailboxName('hiddenLevel1'),
+    parentId: MailboxId(Id('parentFolder')),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(0)),
+    unreadEmails: UnreadEmails(UnsignedInt(0)),
+    totalThreads: TotalThreads(UnsignedInt(0)),
+    unreadThreads: UnreadThreads(UnsignedInt(0)),
+    myRights: MailboxRights(true, true, true, true, true, true, true, true, true),
+    isSubscribed: IsSubscribed(false),
+  );
+
+  static final hiddenLevel2 = Mailbox(
+    id: MailboxId(Id('hiddenLevel2')),
+    name: MailboxName('hiddenLevel2'),
+    parentId: MailboxId(Id('hiddenLevel1')),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(0)),
+    unreadEmails: UnreadEmails(UnsignedInt(0)),
+    totalThreads: TotalThreads(UnsignedInt(0)),
+    unreadThreads: UnreadThreads(UnsignedInt(0)),
+    myRights: MailboxRights(true, true, true, true, true, true, true, true, true),
+    isSubscribed: IsSubscribed(false),
+  );
+
+  static final hiddenLevel3 = Mailbox(
+    id: MailboxId(Id('hiddenLevel3')),
+    name: MailboxName('hiddenLevel3'),
+    parentId: MailboxId(Id('hiddenLevel2')),
+    role: null,
+    sortOrder: SortOrder(sortValue: 1000),
+    totalEmails: TotalEmails(UnsignedInt(0)),
+    unreadEmails: UnreadEmails(UnsignedInt(0)),
+    totalThreads: TotalThreads(UnsignedInt(0)),
+    unreadThreads: UnreadThreads(UnsignedInt(0)),
+    myRights: MailboxRights(true, true, true, true, true, true, true, true, true),
+    isSubscribed: IsSubscribed(false),
+  );
+
+  static final expectedDeleteListThreeLevelNesting = <MailboxId>[
+    MailboxId(Id('hiddenLevel3')),
+    MailboxId(Id('hiddenLevel2')),
+    MailboxId(Id('hiddenLevel1')),
+    MailboxId(Id('parentFolder')),
+  ];
 }