def test_leitura_campo_num_decimal(self):
        self.assertEqual(self.seg_p.valor_titulo, Decimal('100.00'))
def test_supertype(self):
        self.assert_(isinstance(None, NullType))
        self.assert_(isinstance(Optional('a'), NullType))
        self.assert_(isinstance(NotPassed, NotPassedType))
        self.assert_(isinstance(NotPassed, NullType))