test_fixtures_params.py

 from selenium import webdriver

from webdriver_manager.chrome import ChromeDriverManager
import pytest
from webdriver_manager.firefox import GeckoDriverManager


@pytest.fixture(params=["chrome","firefox"],scope='class')
def init_driver(request):
    if request.param== "chrome":
        web_driver=webdriver.Chrome(ChromeDriverManager().install())

    if request.param== "firefox":
        web_driver=webdriver.Firefox(executable_path=GeckoDriverManager().install())

    request.cls.driver = web_driver

    yield
    print("----------------Tear Down--------------------")
    web_driver.close()

@pytest.mark.usefixtures("init_driver")
class BaseTest:
    pass

class Test_Google(BaseTest):
    def test_google_title(self):
        self.driver.get("http://www.google.com")
        assert self.driver.title=="Google"

#pytest PyTestSession\test_fixtures_params.py -v -s --html=test_params.html

#For parallel execution
#pytest PyTestSession\test_fixtures_params.py -v -s -n 2 --html=_new_test_params.html