Index authorized mailbox cache changes in Search

tests/test_mailbox_index.py

@@ -14,6 +14,9 @@ class _DeleteQuery:
     def filter(self, *_criteria):
         return self
 
+    def all(self):
+        return []
+
     def delete(self, *, synchronize_session: bool) -> int:
         if synchronize_session is not False:
             raise AssertionError("bulk invalidation must not synchronize loaded cache rows")