def test_nullbooleanfield_blank(self):
        nullboolean = NullBooleanModel(nbfield=None)
        try:
            nullboolean.full_clean()
        except ValidationError as e:
            self.fail("NullBooleanField failed validation with value of None: %s" % e.messages)
Drop all tables stored in this metadata.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/tests/regressiontests/model_fields/tests.py/BasicFieldTests.test_nullbooleanfield_blank--crossover with--dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/sql/schema.py/MetaData.drop_all