使用会话范围pytest夹具更新Web驱动程序以供类范围夹具使用

Question

谷歌在搜索答案方面让我失望，所以我现在转到这里。

我正在使用pytest和selenium设置一个自动web测试套件。在运行测试之前，我想先编写代码来检查chromewebdriver的更新。我认为最好的方法是使用fixture和webdriver\u manager模块。

我从以下开始，它起作用了

@pytest.fixture()
def chrome_driver_init(request):
    driver = webdriver.Chrome(options=opts, executable_path=ChromeDriverManager(path=TEST_PATH).install())
    request.cls.driver = driver
    driver.get(URL)
    driver.maximize_window()
    yield
    driver.quit()

但每次测试都要检查webdriver的更新，这确实会减慢速度。因此，我尝试了这一点，但不知道如何让子设备使用父设备中的变量。我真的希望它只运行一次更新，并且从那时起子级使用变量，而不需要再次调用更新父级。

#Checks for latest ChromeDriver version
@pytest.fixture(scope='session')
def update_chrome_driver():
    chrome_driver = webdriver.Chrome(options=opts, executable_path=ChromeDriverManager(path=TEST_PATH).install())
    return chrome_driver

#Initalizes chrome driver and opens testing window, runs at the beginning of each test
#Closes test window at end of test
@pytest.fixture(scope='class')
def chrome_driver_init(request, update_chrome_driver):
    driver = update_chrome_driver
    request.cls.driver = driver
    driver.get(URL)
    driver.maximize_window()
    yield
    driver.quit()

我尝试了两个装置的不同范围组合，但最终测试设置失败。有人知道一个干净的方法来让它工作吗？

Answer 1

这里有一件事应该优化您的代码-使用在会话范围内安装ChromeDriver，然后将路径传递给您的夹具。示例：

import pytest
from selenium import webdriver

from webdriver_manager.chrome import ChromeDriverManager


@pytest.fixture(scope='session')
def path_to_chrome():
    return ChromeDriverManager().install()


@pytest.fixture
def chrome_driver_init(path_to_chrome):
    driver = webdriver.Chrome(executable_path=path_to_chrome)
    driver.get('https://google.com')
    driver.maximize_window()
    yield
    driver.quit()


def test_1(chrome_driver_init):
    pass


def test_2(chrome_driver_init):
    pass

然后你可以看到webdriver_manager只调用一次：

pytest tests/test_some.py 
========================================================================================== test session starts ===========================================================================================
platform darwin -- Python 3.7.2, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
rootdir: /Users/user/SOTriageProject/tests, configfile: pytest.ini
plugins: env-0.6.2, cov-3.0.0
collected 2 items                                                                                                                                                                                        

tests/test_some.py::test_1 
--------------------------------------------------------------------------------------------- live log setup ---------------------------------------------------------------------------------------------
INFO     WDM:logger.py:24 

INFO     WDM:logger.py:24 ====== WebDriver manager ======
INFO     WDM:logger.py:24 Current google-chrome version is 94.0.4606
INFO     WDM:logger.py:24 Get LATEST driver version for 94.0.4606
INFO     WDM:logger.py:24 Driver [/Users/user/.wdm/drivers/chromedriver/mac64/94.0.4606.61/chromedriver] found in cache
PASSED                                                                                                                                                                                             [ 50%]
tests/test_some.py::test_2 PASSED                                                                                                                                                                  [100%]

=========================================================================================== 2 passed in 5.96s ============================================================================================

P、 我不明白第一条消息里的意思

request.cls.driver = driver

是，所以我把它从例子中剪掉了。