PEP fixes

InvenTree/label/test_api.py

@@ -3,10 +3,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from rest_framework.test import APITestCase
-
 from django.urls import reverse
-from django.contrib.auth import get_user_model
 
 from InvenTree.api_tester import InvenTreeAPITestCase