A series of unit tests is available for the frePPLe user interface.
The page https://docs.djangoproject.com/en/dev/topics/testing/overview/ describes the django testing framework used in frePPLe.
The test suite is run as one of the commands available with in frepplectl.py script:
frepplectl.py test freppledb
You are encouraged to submit additional test cases to the test suite, wich is used to validate each new release.