'tests symbols are rendered properly'

def test_operator_rendering(self):

    self.assertEqual('=', six.text_type(EqualsOperator()))
    self.assertEqual('!=', six.text_type(NotEqualsOperator()))
    self.assertEqual('IN', six.text_type(InOperator()))
    self.assertEqual('>', six.text_type(GreaterThanOperator()))
    self.assertEqual('>=', six.text_type(GreaterThanOrEqualOperator()))
    self.assertEqual('<', six.text_type(LessThanOperator()))
    self.assertEqual('<=', six.text_type(LessThanOrEqualOperator()))
    self.assertEqual('CONTAINS', six.text_type(ContainsOperator()))
