add tests for user model insert delete rows columns

base/src/test/user_model/mod.rs

@@ -12,6 +12,7 @@ mod test_general;
 mod test_grid_lines;
 mod test_keyboard_navigation;
 mod test_last_empty_cell;
+mod test_multi_row_column;
 mod test_on_area_selection;
 mod test_on_expand_selected_range;
 mod test_on_paste_styles;