python - selenium.common.exceptions.WebDriverException : Message: no such session while executing testcases through Python unittest module

Question

import unittest
from selenium import webdriver
from selenium.webdriver.common.keys import Keys

class KenLogin(unittest.TestCase):

    def test_globe(self):

        global driver

        driver = webdriver.Chrome(executable_path='E:\Learning\chromedriver.exe')
        driver.maximize_window()

    def test_login(self):



        driver.implicitly_wait(2000)
        driver.get("http://qa.kenzen.com")
        username = driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div[2]/form/div[1]/input")
        password = driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div[2]/form/div[2]/input")

        username.send_keys("pardeepk@clovity.com")
        password.send_keys("Kenzen@123")

        button = driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div[2]/form/button")

        button.send_keys(Keys.ENTER)
        print("Login Pass")


    def test_home(self):

        driver.implicitly_wait(2000)

        teamsummary = driver.find_element_by_id("teamsummary")

        teamsummary.click()
        print("Home Pass")

    def test_newteam(self):

        addteam = driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div/div[1]/ul[2]/li/button")

        addteam.click()

        teamname = driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div/div[2]/div/div[1]/input")#.send_keys(data)

        admin = driver.find_element_by_id("administrator")
        admin.send_keys("qa@kenzen.com,qa1@kenzen.com")
        addteambutton = driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div/div[2]/div/div[6]/button")
        addteambutton.click()

        print("Team Added")

    def tearDown(self):
        driver.close()


if __name__ == "__main__":
    unittest.main()

谁能帮我解决这个问题吗？

我尝试运行 1 个以上的函数并收到错误:

查找文件...完成。导入测试模块...完成。

================================================== =======================

错误:test_home(kenZen.KenLogin.KenLogin)

Traceback (most recent call last): File "E:\Learning\Workplace\kenZen\kenZen\KenLogin.py", line 37, in test_home driver.implicitly_wait(2000) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 895, in implicitly_wait 'ms': float(time_to_wait) * 1000}) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 314, in execute self.error_handler.check_response(response) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.WebDriverException: Message: no such session (Driver info: chromedriver=2.38.552522 (437e6fbedfa8762dec75e2c5b3ddb86763dc9dcb),platform=Windows NT 10.0.14393 x86_64)

================================================== =======================

错误:test_home(kenZen.KenLogin.KenLogin)

Traceback (most recent call last): File "E:\Learning\Workplace\kenZen\kenZen\KenLogin.py", line 60, in tearDown driver.close() File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 681, in close self.execute(Command.CLOSE) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 314, in execute self.error_handler.check_response(response) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.WebDriverException: Message: no such session (Driver info: chromedriver=2.38.552522 (437e6fbedfa8762dec75e2c5b3ddb86763dc9dcb),platform=Windows NT 10.0.14393 x86_64)

================================================== =======================

错误:test_login(kenZen.KenLogin.KenLogin)

Traceback (most recent call last): File "E:\Learning\Workplace\kenZen\kenZen\KenLogin.py", line 21, in test_login driver.implicitly_wait(2000) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 895, in implicitly_wait 'ms': float(time_to_wait) * 1000}) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 314, in execute self.error_handler.check_response(response) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.WebDriverException: Message: no such session (Driver info: chromedriver=2.38.552522 (437e6fbedfa8762dec75e2c5b3ddb86763dc9dcb),platform=Windows NT 10.0.14393 x86_64)

================================================== =======================

错误:test_login(kenZen.KenLogin.KenLogin)

Traceback (most recent call last): File "E:\Learning\Workplace\kenZen\kenZen\KenLogin.py", line 60, in tearDown driver.close() File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 681, in close self.execute(Command.CLOSE) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 314, in execute self.error_handler.check_response(response) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.WebDriverException: Message: no such session (Driver info: chromedriver=2.38.552522 (437e6fbedfa8762dec75e2c5b3ddb86763dc9dcb),platform=Windows NT 10.0.14393 x86_64)

================================================== =======================

错误:test_newteam(kenZen.KenLogin.KenLogin)

Traceback (most recent call last): File "E:\Learning\Workplace\kenZen\kenZen\KenLogin.py", line 46, in test_newteam addteam = driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div/div[1]/ul[2]/li/button") File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 387, in find_element_by_xpath return self.find_element(by=By.XPATH, value=xpath) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 957, in find_element 'value': value})['value'] File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 314, in execute self.error_handler.check_response(response) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.WebDriverException: Message: no such session (Driver info: chromedriver=2.38.552522 (437e6fbedfa8762dec75e2c5b3ddb86763dc9dcb),platform=Windows NT 10.0.14393 x86_64)

================================================== =======================

错误:test_newteam(kenZen.KenLogin.KenLogin)

Traceback (most recent call last): File "E:\Learning\Workplace\kenZen\kenZen\KenLogin.py", line 60, in tearDown driver.close() File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 681, in close self.execute(Command.CLOSE) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 314, in execute self.error_handler.check_response(response) File "C:\Users\Pardeep\AppData\Local\Programs\Python\Python36-32\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.WebDriverException: Message: no such session (Driver info: chromedriver=2.38.552522 (437e6fbedfa8762dec75e2c5b3ddb86763dc9dcb),platform=Windows NT 10.0.14393 x86_64)

----------------------------------------------------------------------
Ran 4 tests in 7.928s

FAILED (errors=6)

Answer 1

与 Python 合作时和 unittest您需要注意以下事项:

• def setUp(self):setUp()是初始化的一部分，此方法将在每个测试函数之前调用您将在这个测试用例类中编写。
• maximize_window():不要使用 maximize_window()，而是使用 chrome.options 最大化浏览器窗口的类。
• implicitly_wait():Implicit Wait一旦设置，隐式等待就会在WebDriver对象实例的生命周期内设置。
• 始终在 tearDown(){} 方法中调用 driver.quit() 来关闭和销毁 WebDriver 和 Web Client 优雅地实例化。

• 这是您自己的代码块，并进行了上述细微调整:

  import unittest
  from selenium import webdriver
  from selenium.webdriver.common.keys import Keys
  from selenium.webdriver.chrome.options import Options
  from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
  
  class KenLogin(unittest.TestCase):
  
      def setUp(self):
          global driver
          options = Options()
          options.add_argument("start-maximized")
          options.add_argument("disable-infobars")
          options.add_argument("--disable-extensions")
          cap = DesiredCapabilities().CHROME
          cap = options.to_capabilities()
          self.driver = webdriver.Chrome(desired_capabilities=cap, executable_path=r'C:\Utility\BrowserDrivers\chromedriver.exe')
  
      def test_login(self):
          self.driver.implicitly_wait(2000)
          self.driver.get("http://qa.kenzen.com")
          username = self.driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div[2]/form/div[1]/input")
          password = self.driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div[2]/form/div[2]/input")
          username.send_keys("pardeepk@clovity.com")
          password.send_keys("Kenzen@123")
          button = self.driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div[2]/form/button")
          button.send_keys(Keys.ENTER)
          print("Login Pass")
  
      def tearDown(self):
          self.driver.quit()
  
  
  if __name__ == "__main__":
      unittest.main()
  

• 控制台输出:

  Login Pass
  .
  ----------------------------------------------------------------------
  Ran 1 test in 13.731s
  
  OK
  

<小时/>

根据您的评论更新，如果您希望仅调用一次 setup() 函数，则可以使用 setUpClass和 tearDownClass当类执行时，在测试之前和之后执行的类方法。

• 这是您自己的代码块，并进行了上述细微调整:

  import unittest
  from selenium import webdriver
  from selenium.webdriver.common.keys import Keys
  from selenium.webdriver.chrome.options import Options
  from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
  
  class KenLogin(unittest.TestCase):
  
      @classmethod
      def setUpClass(self):
          global driver
          options = Options()
          options.add_argument("start-maximized")
          options.add_argument("disable-infobars")
          options.add_argument("--disable-extensions")
          cap = DesiredCapabilities().CHROME
          cap = options.to_capabilities()
          self.driver = webdriver.Chrome(desired_capabilities=cap, executable_path=r'C:\Utility\BrowserDrivers\chromedriver.exe')
  
      def test_login(self):
          self.driver.implicitly_wait(2000)
          self.driver.get("http://qa.kenzen.com")
          username = self.driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div[2]/form/div[1]/input")
          password = self.driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div[2]/form/div[2]/input")
          username.send_keys("pardeepk@clovity.com")
          password.send_keys("Kenzen@123")
          button = self.driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div/div[2]/form/button")
          button.send_keys(Keys.ENTER)
          print("ENTER Key pressed")
  
      def test_print_success(self):
          print("Login Pass")
  
      @classmethod
      def tearDownClass(self):
          self.driver.quit()
  
  
  if __name__ == "__main__":
      unittest.main()
  

• 控制台输出:

  ENTER Key pressed
  .Login Pass
  .
  ----------------------------------------------------------------------
  Ran 2 tests in 18.187s
  
  OK
  

<小时/>

引用文献

• 在这里您可以找到关于 What is unittest in selenium Python? 的详细讨论

• 在这里您可以找到关于 Unittest setUp/tearDown for several tests 的详细讨论

• 在这里您可以找到关于 Run setUp only once 的详细讨论