def test_decimal_places_validation_errors(self):
        """
        Test decimal specific validation.  In django
        1.8 this happens in validate() but once support for 1.8
        is dropped it will be in run_validators, so this test uses clean()
        """
        field = DecimalFractionField(max_digits=3, decimal_places=2)

        with self.assertRaises(ValidationError):
            # too many non-decimal digits
            field.clean('10')

        with self.assertRaises(ValidationError):
            # too many decimal digits
            field.clean('1/100')
    def test_to_python_method_validation_errors(self):
        """
        Exceptions here are tested for and raised from within to_python()
        """
        field = DecimalFractionField()
        with self.assertRaises(ValidationError):
            field.clean('abcd')

        with self.assertRaises(ValidationError):
            field.clean('1 1 1/3')

        with self.assertRaises(ValidationError):
            field.clean('1 1')