conftest.py

import pytest
import sys
from selenium import webdriver


# tell python where our modules are...
sys.path.append('pages')
sys.dont_write_bytecode = True

# add cli options...
def pytest_addoption(parser):
  parser.addoption('--url', action='store', default='https://qualityshepherd.com', help='specify the base URL to test against')
  parser.addoption('--driver', action='store', default='chrome', help='chrome or firefox')

# driver fixture passed to all tests
@pytest.fixture(scope='session')
def driver(request):
  driver = request.config.getoption('--driver')
  if driver == 'firefox' or driver == 'ff':
      driver = webdriver.Firefox()
  elif driver == 'chrome':
      driver = webdriver.Chrome()
  else:
      raise ValueError('invalid driver name: ' + driver)
  driver.set_window_size(1200, 800)
  driver.base_url = request.config.getoption('--url') or 'https://qualityshepherd.com/'
  yield driver
  driver.quit()