数据驱动ddt

相比用for循环结合“一条一条加载用例”方式更为快捷的方法，是使用ddt

所有的测试用例所需的用例数据都作为类属性放在测试用例类中：

import unittest
from ddt import ddt, data
from exercise04_ddt.funcdemo_unittest import login_check


@ddt
class LoginTestCase(unittest.TestCase):
    cases = [{"expected": {"code": 0, "msg": "登陆成功"}, "data": ["python", "123456"]},
             {"expected": {"code": 1, "msg": "账号或密码不正确"}, "data": ["python", "12345"]},
             {"expected": {"code": 1, "msg": "账号或密码不正确"}, "data": ["pyth", "123456"]},
             {"expected": {"code": 1, "msg": "所有参数不能为空"}, "data": [None, "123456"]},
             {"expected": {"code": 1, "msg": "所有参数不能为空"}, "data": ["python", None]},
             ]

    @data(*cases)
    def test_login(self, case):
        expected = case["expected"]
        data = case["data"]
        res = login_check(*data)
        self.assertEqual(expected, res)