Check on integration test if user has log in

I am trying to create a test for checking in the user has successfully log in or not. But I am having troubles to check once the user fulfills the log in form if it appears as authenticated or not.

I try to wait 10 s to leave time to Django to do the request , but I don't manage

My actual test is

class MySeleniumTests(StaticLiveServerTestCase):

@classmethod
def setUpClass(cls):
    super(MySeleniumTests, cls).setUpClass()
    cls.driver = WebDriver()

def setUp(self):
    pass

@classmethod
def tearDownClass(cls):
    cls.driver.quit()
    super(MySeleniumTests, cls).tearDownClass()


def test_login(self):
    driver = self.driver
    user = auth.get_user(self.client)
    self.assertFalse(user.is_authenticated)

    user = User.objects.create_user(username="testuser", password="testuser")

    driver.get("http://127.0.0.1:8000/cuentas/login/")
    driver.find_element_by_id("id_login").click()
    driver.find_element_by_id("id_login").clear()
    driver.find_element_by_id("id_login").send_keys("testuser")
    driver.find_element_by_id("id_password").clear()
    driver.find_element_by_id("id_password").send_keys("testuser")
    driver.find_element_by_id("login-btn").click()

    self.driver.implicitly_wait(10)
    is_a = auth.get_user(self.client).is_authenticated #<-Problem here
    self.assertTrue(is_a)
    self.driver.implicitly_wait(10)
    driver.get("http://127.0.0.1:8000/")