Added tests for the new set(required=True) introduced two commits earlier.
Added tests for the new set(required=True) introduced two commits earlier.

Alwnikrotikz/formalchemy,Alwnikrotikz/formalchemy,pombreda/formalchemy,Alwnikrotikz/formalchemy,pombreda/formalchemy,pombreda/formalchemy,Alwnikrotikz/formalchemy,pombreda/formalchemy