I can apply formulas

tests/controls/test_datagrid_columns_manager.py

@@ -37,6 +37,9 @@ class MockDataGrid(MultipleInstance):
   def get_table_name(self):
     return "mock_table"
 
+  def get_formula_engine(self):
+    return None
+
 
 @pytest.fixture
 def mock_datagrid(root_instance):