test(src/types/newtypes): Test if a full round-trip works

src/types/newtypes/mod.rs

@@ -108,3 +108,34 @@ impl Drop for String {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::types::types_list;
+
+    use super::String;
+
+    #[test]
+    fn test_string_round_trip() {
+        let start = "HI! I'm a nice string".to_owned();
+        let wrapper: String = start.clone().into();
+
+        assert_eq!(&start, wrapper.as_str());
+        assert_eq!(start, wrapper.to_string());
+        assert_eq!(start, wrapper.into_std_string());
+    }
+
+    #[test]
+    fn test_string_round_trip_through_c() {
+        let start = "HI! I'm a nice string".to_owned();
+
+        let c_string: types_list::String = start.clone().into();
+        let wrapper: String = Into::<types_list::String>::into(c_string)
+            .try_into()
+            .unwrap();
+
+        assert_eq!(&start, wrapper.as_str());
+        assert_eq!(start, wrapper.to_string());
+        assert_eq!(start, wrapper.into_std_string());
+    }
+}