Made some tests behave nicer re connection handling

tests/regressiontests/backends/tests.py

@@ -559,21 +559,27 @@ class ThreadTests(TestCase):
         """
         connections_set = set()
         connection.cursor()
-        connections_set.add(connection.connection)
+        connections_set.add(connection)
         def runner():
-            from django.db import connection
+            # Passing django.db.connection between threads doesn't work while
+            # connections[DEFAULT_DB_ALIAS] does.
+            from django.db import connections
+            connection = connections[DEFAULT_DB_ALIAS]
             connection.cursor()
-            connections_set.add(connection.connection)
+            connections_set.add(connection)
         for x in range(2):
             t = threading.Thread(target=runner)
             t.start()
             t.join()
-        self.assertEqual(len(connections_set), 3)
+        # Check that each created connection got different inner connection.
+        self.assertEqual(
+            len(set([conn.connection for conn in connections_set])),
+            3)
         # Finish by closing the connections opened by the other threads (the
         # connection opened in the main thread will automatically be closed on
         # teardown).
         for conn in connections_set:
-            if conn != connection.connection:
+            if conn != connection:
                 conn.close()
 
     def test_connections_thread_local(self):

tests/regressiontests/delete_regress/tests.py

@@ -3,7 +3,8 @@ from __future__ import absolute_import
 import datetime
 
 from django.conf import settings
-from django.db import backend, transaction, DEFAULT_DB_ALIAS, models
+from django.db import transaction, DEFAULT_DB_ALIAS, models
+from django.db.utils import ConnectionHandler
 from django.test import TestCase, TransactionTestCase, skipUnlessDBFeature
 
 from .models import (Book, Award, AwardNote, Person, Child, Toy, PlayedWith,
@@ -17,17 +18,8 @@ from .models import (Book, Award, AwardNote, Person, Child, Toy, PlayedWith,
 class DeleteLockingTest(TransactionTestCase):
     def setUp(self):
         # Create a second connection to the default database
-        conn_settings = settings.DATABASES[DEFAULT_DB_ALIAS]
-        self.conn2 = backend.DatabaseWrapper({
-            'HOST': conn_settings['HOST'],
-            'NAME': conn_settings['NAME'],
-            'OPTIONS': conn_settings['OPTIONS'],
-            'PASSWORD': conn_settings['PASSWORD'],
-            'PORT': conn_settings['PORT'],
-            'USER': conn_settings['USER'],
-            'TIME_ZONE': settings.TIME_ZONE,
-        })
-
+        new_connections = ConnectionHandler(settings.DATABASES)
+        self.conn2 = new_connections[DEFAULT_DB_ALIAS]
         # Put both DB connections into managed transaction mode
         transaction.enter_transaction_management()
         transaction.managed(True)