How to use the djet.utils function in djet

def test_post_should_logout_logged_in_user(self):
        user = create_user()
        token = models.Token.objects.create(user=user, client='my-device')

        request = self.factory.post(user=user, token=token)
        response = self.view(request)

        self.assert_status_equal(response, status.HTTP_200_OK)
        self.assertEqual(response.data, None)
        with self.assertRaises(models.Token.DoesNotExist):
            utils.refresh(token)

def test_post_should_not_set_new_password_if_user_does_not_exist(self):
        user = create_user()
        data = {
            'uid': djoser.utils.encode_uid(user.pk + 1),
            'token': default_token_generator.make_token(user),
            'new_password': 'new password',
        }
        request = self.factory.post(data=data)

        response = self.view(request)

        self.assert_status_equal(response, status.HTTP_400_BAD_REQUEST)
        self.assertIn('uid', response.data)
        user = utils.refresh(user)
        self.assertFalse(user.check_password(data['new_password']))

def test_post_should_not_set_new_password_if_mismatch(self):
        user = create_user()
        data = {
            'new_password': 'new password',
            're_new_password': 'wrong',
            'current_password': 'secret',
        }
        request = self.factory.post(user=user, data=data)

        response = self.view(request)

        self.assert_status_equal(response, status.HTTP_400_BAD_REQUEST)
        user = utils.refresh(user)
        self.assertTrue(user.check_password(data['current_password']))

def test_put_should_update_user(self):
        user = create_user()
        data = {
            'email': 'ringo@beatles.com',
        }
        request = self.factory.put(user=user, data=data)

        response = self.view(request)

        self.assert_status_equal(response, status.HTTP_200_OK)
        user = utils.refresh(user)
        self.assertEqual(data['email'], user.email)

def test_post_should_not_set_new_password_if_broken_uid(self):
        user = create_user()
        data = {
            'uid': 'x',
            'token': default_token_generator.make_token(user),
            'new_password': 'new password',
        }
        request = self.factory.post(data=data)

        response = self.view(request)

        self.assert_status_equal(response, status.HTTP_400_BAD_REQUEST)
        self.assertIn('uid', response.data)
        user = utils.refresh(user)
        self.assertFalse(user.check_password(data['new_password']))