def test_add_rule(self):
fc = RegexCriterion(r"^[-+]?\d*\.\d+$")
fc2 = RegexCriterion(r"^[-+]?\d*\.\d+$")
rule = ParserRule(criteria=[fc, fc2], allow_partial=False)
parser = Parser(rules=[rule, rule])
parser.add_rule(rule)
assert len(parser.rules) == 3
