diff --git a/tests/unit/mock_adapter.py b/tests/unit/mock_adapter.py
index c1f8a062668..458f1dbd570 100644
--- a/tests/unit/mock_adapter.py
+++ b/tests/unit/mock_adapter.py
@@ -33,6 +33,9 @@ def rename_relation(self, *args, **kwargs):
         def get_columns_in_relation(self, *args, **kwargs):
             return self.responder.get_columns_in_relation(*args, **kwargs)
 
+        def get_catalog_for_single_relation(self, *args, **kwargs):
+            return self.responder.get_catalog_for_single_relation(*args, **kwargs)
+
         def expand_column_types(self, *args, **kwargs):
             return self.responder.expand_column_types(*args, **kwargs)