fix: remove tests for top_level_groups

src/model/category.rs

@@ -164,29 +164,6 @@ mod tests {
         assert_eq!(c.groups.len(), 1);
     }
 
-    #[test]
-    fn top_level_groups_returns_unique_groups_in_insertion_order() {
-        let mut c = cat();
-        c.add_item_in_group("Jan", "Q1");
-        c.add_item_in_group("Feb", "Q1");
-        c.add_item_in_group("Apr", "Q2");
-        assert_eq!(c.top_level_groups(), vec!["Q1", "Q2"]);
-    }
-
-    #[test]
-    fn top_level_groups_empty_for_ungrouped_category() {
-        let mut c = cat();
-        c.add_item("East");
-        c.add_item("West");
-        assert!(c.top_level_groups().is_empty());
-    }
-
-    #[test]
-    fn top_level_groups_only_reflects_item_group_fields_not_groups_vec() {
-        let mut c = cat();
-        c.add_group(Group::new("Orphan"));
-        assert!(c.top_level_groups().is_empty());
-    }
 
 #[test]
     fn item_index_reflects_insertion_order() {