def __new__(cls):
    if (not cls.selenium):
        selenium = getattr(webdriver, os.environ.get('TESTS_WEBDRIVER', 'Firefox'))()
        selenium.implicitly_wait(WAIT_TIME)
        atexit.register(selenium.quit)
        cls.selenium = selenium
    return cls.selenium
def __new__(cls):
    if (not cls.selenium):
        selenium = getattr(webdriver, os.environ.get('TESTS_WEBDRIVER', 'Firefox'))()
        selenium.implicitly_wait(WAIT_TIME)
        atexit.register(selenium.quit)
        cls.selenium = selenium
    return cls.selenium