Write more tests

[NotJustAnna]

Write a new file to unit test all the new stuff.

Includes, but not limited to:

• [x] Validate Types.mapOf(K, V) against new TypeReference<Map<K, V>>, as well as other cases.
• [x] Tests for all run methods, as well as runAsync ones.
• [ ] Test unwrapLists behaviour as well as consistency.
• [ ] Test correctly for Result<T> methods, as well as auto-closing behaviour.
• [x] Add tests for db-urls.