Pyhon parallel run exeuciont via py.test for selenium webdriver

execution.bat

py.test -n 2 .

output.log

============================= test session starts =============================
platform win32 -- Python 2.7.3 -- pytest-2.5.1
plugins: xdist
gw0 [3] / gw1 [3]
scheduling tests via LoadScheduling
...
========================== 3 passed in 48.16 seconds ==========================

test_sample.py

from selenium import webdriver
import time


class Driver(object):
    _instance = None

    @classmethod
    def get(cls):
        if not getattr(cls, '_instance'):
            cls._instance = webdriver.Firefox()
        return cls._instance

    @classmethod
    def close(cls):
        cls.get().quit()
        cls._instance = None


class PageObjectTwo(object):
    def action(self):
        print Driver.get().title

class PageObjectOne(object):
    def __init__(self, url):
        self.url = url

    def open(self):
        Driver.get().get(self.url)
        time.sleep(2)
        return PageObjectTwo()

    def close(self):
        Driver.close()


class TestSampleTestSuite:
    def test_1(self):
        page = PageObjectOne('http://lessons2.ru')
        another_page = page.open()
        another_page.action()
        page.close()

    def test_2(self):
        page = PageObjectOne('http://automated-testing.info')
        page.open()
        PageObjectTwo().action()
        page.close()

    def test_3(self):
        page = PageObjectOne('http://poliarush.com')
        page.open()
        page.close()