@pytest.fixture(scope='session')
def app(request):
    fixture = Application()
    browser.open_url(home_url)
    request.addfinalizer(fixture.destroy)
    return fixture

class Application:
    def __init__(self):
        self.test = Test(self)
        self.test1 = Test1(self)

class Test:
    def __init__(self, app):
        self.app = app

    def open_page(self):
        browser.find_element_by_css(x)

class Test1:
    def __init__(self, app):
        self.app = app

    def open_page1(self):
        browser.find_element_by_css(y)

def test1(app):
    app.test.open_page()

def test2(app):
    app.test1.open_page1()