Refs #9804 -- Fixed test for sequence reset of M2M with inherited through model.

tests/test_runner/tests.py

@@ -17,7 +17,7 @@ from django.test.runner import DiscoverRunner
 from django.test.testcases import connections_support_transactions
 from django.test.utils import dependency_ordered
 
-from .models import Person
+from .models import B, Person, Through
 
 
 class DependencyOrderingTests(unittest.TestCase):
@@ -327,26 +327,31 @@ class SetupDatabasesTests(unittest.TestCase):
         )
 
 
+@skipUnlessDBFeature('supports_sequence_reset')
 class AutoIncrementResetTest(TransactionTestCase):
     """
-    Here we test creating the same model two times in different test methods,
-    and check that both times they get "1" as their PK value. That is, we test
-    that AutoField values start from 1 for each transactional test case.
+    Creating the same models in different test methods receive the same PK
+    values since the sequences are reset before each test method.
     """
 
     available_apps = ['test_runner']
 
     reset_sequences = True
 
-    @skipUnlessDBFeature('supports_sequence_reset')
-    def test_autoincrement_reset1(self):
+    def _test(self):
+        # Regular model
         p = Person.objects.create(first_name='Jack', last_name='Smith')
         self.assertEqual(p.pk, 1)
+        # Many-to-many through model
+        b = B.objects.create()
+        t = Through.objects.create(person=p, b=b)
+        self.assertEqual(t.pk, 1)
+
+    def test_autoincrement_reset1(self):
+        self._test()
 
-    @skipUnlessDBFeature('supports_sequence_reset')
     def test_autoincrement_reset2(self):
-        p = Person.objects.create(first_name='Jack', last_name='Smith')
-        self.assertEqual(p.pk, 1)
+        self._test()
 
 
 class EmptyDefaultDatabaseTest(unittest.TestCase):