执行测试用例一个类只需要打开一次浏览器

base类

from selenium import webdriver
import unittest
import traceback
import env
import datetime
from vendor.log.log import Log


class BaseCase(unittest.TestCase):
    @classmethod
    def setUpClass(cls):        # 必须使用@classmethod 装饰器,所有test运行前运行一次
        cls.log = Log()
        # options.add_argument('headless')   # 无界面
        options = webdriver.ChromeOptions()
        prefs = {"download.default_directory": env.DOWNLOAD_FILE_PATH}
        options.add_experimental_option("prefs", prefs)
        cls.driver = webdriver.Chrome(options=options)
        cls.driver.maximize_window()
        cls.failureException = cls.failure_monitor()

    def setUp(self):            # 每个测试函数运行前运行
        pass

    def tearDown(self):         # 每个测试函数运行完后执行
        self.driver.refresh()   # 主要要刷新页面

    @classmethod              # 必须使用@classmethod装饰器,所有test运行完后运行一次
    def tearDownClass(cls):
        cls.driver.quit()

    def failure_monitor(self):              # 知识点
        test_case = self  # 将self赋值给test_case，以便下方的AssertionErrorPlus内部类可调用外部类的方法

        class AssertionErrorPlus(AssertionError):
            def __init__(self, msg):
                try:
                    cur_method = test_case._testMethodName  # 当前test函数的名称
                    time_code = ''.join(datetime.datetime.now().strftime("%Y-%m-%d-%H-%M-%S"))
                    file_name = '%s_%s.png' % (cur_method, time_code)
                    test_case.driver.get_screenshot_as_file(env.CASE_FAILURE_PATH + file_name)  # 截图生成png文件
                    print('失败截图已保存到: %s' % file_name)
                    msg += '\n失败截图文件: %s' % file_name
                except BaseException:
                    print('截图失败: %s' % traceback.format_exc())

                super(AssertionErrorPlus, self).__init__(msg)

        return AssertionErrorPlus  # 返回AssertionErrorPlus类

子类：

@ddt.ddt
class NewTicketCase(BaseCase):
    @classmethod
    def setUpClass(cls):
        super().setUpClass()
        # 如果不能添加cookie，就让他登录一遍，再继续登录后的操作
        cls.driver.get("http://test.autoxiaoer.com:8084/#/login")
        ab = AdminLoginBusiness(cls.driver)  # 先使用admin_login_yaml文件
        ab.admin_login('100473', '123456')
        cls.nb = NewTicketBusiness(cls.driver)
        cls.nb.before_handle()
        cls.nh = NewTicketHandle(cls.driver)
        warnings.simplefilter("ignore", ResourceWarning)

    def setUp(self):
        super().setUp()
        self.nb.new_service_ticket_button_click()

    def tearDown(self):
        super().tearDown()
        if "test_new_ticket" in self._testMethodName:
            time.sleep(9)

    @classmethod  # 必须使用@classmethod装饰器,所有test运行完后运行一次
    def tearDownClass(cls):
        super().tearDownClass()