diff --git a/backend/tests/unit/test_action_item_reminder_cancel_on_complete.py b/backend/tests/unit/test_action_item_reminder_cancel_on_complete.py
index c187e59c55..de3b216015 100644
--- a/backend/tests/unit/test_action_item_reminder_cancel_on_complete.py
+++ b/backend/tests/unit/test_action_item_reminder_cancel_on_complete.py
@@ -53,11 +53,25 @@ def exec_module(self, m):
         pass
 
 
+def _install_stub_module(name):
+    module = _AutoMock(name)
+    sys.modules[name] = module
+    parent_name, _, attr = name.rpartition(".")
+    parent = sys.modules.get(parent_name)
+    if parent is not None:
+        setattr(parent, attr, module)
+    return module
+
+
 def _load_real_notifications():
     sys.path.insert(0, str(BACKEND_DIR))
     finder = _Finder()
     sys.meta_path.insert(0, finder)
     try:
+        firebase_admin = _install_stub_module("firebase_admin")
+        firebase_admin.messaging = _install_stub_module("firebase_admin.messaging")
+        firebase_admin.auth = _install_stub_module("firebase_admin.auth")
+
         import utils.notifications as notif
 
         return notif
diff --git a/backend/tests/unit/test_batch_upload_storage.py b/backend/tests/unit/test_batch_upload_storage.py
index 08045593a2..ace9265d05 100644
--- a/backend/tests/unit/test_batch_upload_storage.py
+++ b/backend/tests/unit/test_batch_upload_storage.py
@@ -17,6 +17,9 @@
 
 # Mock heavy dependencies at sys.modules level before importing storage
 sys.modules.setdefault("database._client", MagicMock())
+sys.modules.setdefault("database.redis_db", MagicMock())
+sys.modules.setdefault("database.users", MagicMock())
+sys.modules.setdefault("opuslib", MagicMock())
 
 _mock_gcs_storage = MagicMock()
 _mock_gcs_client_instance = MagicMock()
@@ -586,6 +589,8 @@ def setup_class(cls):
             'database.tasks',
             'database.plugins',
             'database.notifications',
+            'database.vector_db',
+            'pinecone',
         ]:
             sys.modules.setdefault(mod_name, MagicMock())