Writing unit-tests for PGSQL functions in PGPython - is it possible/reasonable?

I've found interesting PL/PGSQL framework for unit-testing of PL/PGSQL procedures, called pgTAP. But PostgreSQL supports another language for stored procedures - Python, which already has unit-testing framework in standard library and assert statement. What if write unit-tests for PGSQL procedures in PGPython?

Is it possible? Is it good idea?