test: add tests to catalog.delete function

01.workspace/heave/src/str/catalog.rs

@@ -572,13 +572,35 @@ mod tests {
     #[test]
     fn delete_should_mark_entity_as_to_delete() {
         // Should mark an existing entity's state as 'ToDelete'.
-        todo!();
+        let mut catalog = Catalog::new("dummy.db");
+        let item = Item {
+            id: "item-123".to_string(),
+            name: "Test Item".to_string(),
+            price: 100,
+            in_stock: true,
+        };
+        let item_id = item.id.clone();
+        catalog.insert(item);
+        catalog.delete(&item_id);
+        let entity = catalog.items.get(&item_id).unwrap();
+        assert_eq!(entity.state, EntityState::ToDelete);
     }
 
     #[test]
     fn delete_should_have_no_effect_for_nonexistent_id() {
         // Should have no effect if the entity ID does not exist.
-        todo!();
+        let mut catalog = Catalog::new("dummy.db");
+        let item = Item {
+            id: "item-123".to_string(),
+            name: "Test Item".to_string(),
+            price: 100,
+            in_stock: true,
+        };
+        catalog.insert(item);
+        let original_items = catalog.items.clone();
+        // Attempt to delete a non-existent entity, which should not panic or change anything.
+        catalog.delete("nonexistent-id");
+        assert_eq!(catalog.items, original_items);
     }
 
     // ## 'persist()'