Add test for test_get_prefetchable_fields

netbox/utilities/tests/test_prefetch.py

@@ -0,0 +1,17 @@
+from circuits.models import Circuit, Provider
+from utilities.prefetch import get_prefetchable_fields
+from utilities.testing.base import TestCase
+
+
+class GetPrefetchableFieldsTest(TestCase):
+    """
+    Verify the operation of get_prefetchable_fields()
+    """
+    def test_get_prefetchable_fields(self):
+        field_names = get_prefetchable_fields(Provider)
+        self.assertIn('asns', field_names)  # ManyToManyField
+        self.assertIn('circuits', field_names)  # Reverse relation
+        self.assertIn('tags', field_names)  # Tags
+
+        field_names = get_prefetchable_fields(Circuit)
+        self.assertIn('group_assignments', field_names)  # Generic relation