在以下位置初始化firefox驱动程序__init__：
class HomePageTest(unittest.TestCase):
def __init__(self):
self.driver = webdriver.Firefox()
self.driver.implicitly_wait(30)
self.base_url = "https://somewebsite.com"
self.verificationErrors = []
...
def tearDown(self):
self.driver.quit()
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