Support for new error handling.

src/static_data/libraries/nature_library.rs

@@ -140,4 +140,18 @@ pub mod tests {
         let name2 = lib.get_nature_name(&n2);
         assert_eq!(name2, "bar".into());
     }
+
+    #[test]
+    fn create_nature_library_insert_single_and_retrieve_random() {
+        let mut lib = NatureLibraryImpl::new(2);
+        lib.load_nature(
+            "foo".into(),
+            NatureImpl::new(Statistic::HP, Statistic::Attack, 1.1, 0.9),
+        );
+        let n1 = lib.get_random_nature(&mut Random::new(0));
+        assert_eq!(n1.increased_stat(), Statistic::HP);
+        assert_eq!(n1.decreased_stat(), Statistic::Attack);
+        assert_eq!(n1.get_stat_modifier(n1.increased_stat()), 1.1);
+        assert_eq!(n1.get_stat_modifier(n1.decreased_stat()), 0.9);
+    }
 }