manage webdriver instance with pytest

common.py

import pytest


class BaseTest(object):

    @pytest.fixture(scope="class", autouse=True)
    def manage_driver(self, request, driver):
        driver.start()
        request.addfinalizer(driver.stop)

conftest.py

import pytest
from selenium import webdriver


class DriverManager(object):

    def __init__(self):
        self._instance = None

    def start(self, type='ff'):
        # implement logic to create instance depends on condition
        self._instance = webdriver.Firefox()
        return self._instance

    @property
    def instance(self):
        if not self._instance:
            self.start()
        return self._instance

    def stop(self):
        self._instance.close()


@pytest.fixture(scope="module")
def driver():
    return DriverManager()

test_class_1.py

from common import BaseTest


class TestClass1(BaseTest):

    def test_1_1(self, driver):
        driver.instance.get('http://lessons2.ru/python-for-testers/')

    def test_1_2(self, driver):
        driver.instance.get('http://automated-testing.info')


class TestClass2(BaseTest):

    def test_2_1(self, driver):
        driver.instance.get('http://lessons2.ru/')

    def test_2_2(self, driver):
        # driver.instance.get('http://poliarush.com')
        driver.instance.get('http://twitter.com/autotestinfo')

test_class_2.py

from common import BaseTest


class TestClass3(BaseTest):

    def test_3_1(self, driver):
        driver.instance.get('http://www.facebook.com/autotestinfo')

    def test_3_2(self, driver):
        driver.instance.get('http://vk.com/autotestinfo')