Fixed random delete.tests.DeletionTests.test_deletion_order failures.

tests/delete/tests.py

@@ -397,18 +397,35 @@ class DeletionTests(TestCase):
         models.signals.post_delete.connect(log_post_delete)
         models.signals.pre_delete.connect(log_pre_delete)
 
-        r = R.objects.create(pk=1)
-        s1 = S.objects.create(pk=1, r=r)
-        s2 = S.objects.create(pk=2, r=r)
-        T.objects.create(pk=1, s=s1)
-        T.objects.create(pk=2, s=s2)
-        RChild.objects.create(r_ptr=r)
+        r = R.objects.create()
+        s1 = S.objects.create(r=r)
+        s2 = S.objects.create(r=r)
+        t1 = T.objects.create(s=s1)
+        t2 = T.objects.create(s=s2)
+        rchild = RChild.objects.create(r_ptr=r)
+        r_pk = r.pk
         r.delete()
         self.assertEqual(
-            pre_delete_order, [(T, 2), (T, 1), (RChild, 1), (S, 2), (S, 1), (R, 1)]
+            pre_delete_order,
+            [
+                (T, t2.pk),
+                (T, t1.pk),
+                (RChild, rchild.pk),
+                (S, s2.pk),
+                (S, s1.pk),
+                (R, r_pk),
+            ],
         )
         self.assertEqual(
-            post_delete_order, [(T, 1), (T, 2), (RChild, 1), (S, 1), (S, 2), (R, 1)]
+            post_delete_order,
+            [
+                (T, t1.pk),
+                (T, t2.pk),
+                (RChild, rchild.pk),
+                (S, s1.pk),
+                (S, s2.pk),
+                (R, r_pk),
+            ],
         )
 
         models.signals.post_delete.disconnect(log_post_delete)