This seems like a good idea in general, especially now that we're making major changes to this code. A lot of the behavior is covered in SearchEntities(Integration)Test, so these tests don't have to be quite as elaborate as the corresponding REST API tests.
A good start would be:
- find item(s) by label
- find property by label
- find item by ID
- find item by URL
- finds items if no type is specified
- search and results in a different language