add in missing class references

InvenTree/part/test_views.py

@@ -1,12 +1,13 @@
 """ Unit tests for Part Views (see views.py) """
 
-from django.test import TestCase
 from django.urls import reverse
 
+from InvenTree.helpers import InvenTreeTestCase
+
 from .models import Part
 
 
-class PartViewTestCase(TestCase):
+class PartViewTestCase(InvenTreeTestCase):
 
     fixtures = [
         'category',