def test_init(self):
rule = Seq(Equal('X'), type=list)
assert hasattr(rule, 'data_validator')
assert isinstance(rule.data_validator, ValidatorBaseInterface)
assert rule.data_validator([]) == None
self.assertRaises(ValidationError, rule.data_validator, {})
assert hasattr(rule, 'rules')
assert isinstance(rule.rules, list)
assert hasattr(rule, '__len__')
assert len(rule) == 1
