[1.8.x] Improved isolation of applied-migrations table in migration tests.

Backport of 335fc44f6872f4678e48f65e91961ef19d6439b4 from master.

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/migrations/test_base.py b/tests/migrations/test_base.py
index 7b3e2a9fcd..c727785167 100644
--- a/tests/migrations/test_base.py
+++ b/tests/migrations/test_base.py
@@ -1,6 +1,7 @@
 import os
 
 from django.db import connection
+from django.db.migrations.recorder import MigrationRecorder
 from django.test import TransactionTestCase
 from django.utils._os import upath
 
@@ -13,6 +14,11 @@ class MigrationTestBase(TransactionTestCase):
     available_apps = ["migrations"]
     test_dir = os.path.abspath(os.path.dirname(upath(__file__)))
 
+    def tearDown(self):
+        # Reset applied-migrations state.
+        recorder = MigrationRecorder(connection)
+        recorder.migration_qs.filter(app='migrations').delete()
+
     def get_table_description(self, table):
         with connection.cursor() as cursor:
             return connection.introspection.get_table_description(cursor, table)