Tweaked tests from r17702 to run only when using sqlite3 DB(s).

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17733 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/test_runner/tests.py

@@ -9,6 +9,7 @@ import warnings
 
 from django.core.exceptions import ImproperlyConfigured
 from django.core.management import call_command
+from django import db
 from django.test import simple
 from django.test.simple import DjangoTestSuiteRunner, get_tests
 from django.test.testcases import connections_support_transactions
@@ -218,7 +219,6 @@ class CustomTestRunnerOptionsTests(AdminScriptTestCase):
 class Ticket16885RegressionTests(unittest.TestCase):
     def test_ticket_16885(self):
         """Features are also confirmed on mirrored databases."""
-        from django import db
         old_db_connections = db.connections
         try:
             db.connections = db.ConnectionHandler({
@@ -266,9 +266,11 @@ class ModulesTestsPackages(unittest.TestCase):
 
 
 class Sqlite3InMemoryTestDbs(unittest.TestCase):
+
+    @unittest.skipUnless(all(db.connections[conn].vendor == 'sqlite' for conn in db.connections),
+                         "This is a sqlite-specific issue")
     def test_transaction_support(self):
         """Ticket #16329: sqlite3 in-memory test databases"""
-        from django import db
         old_db_connections = db.connections
         for option in ('NAME', 'TEST_NAME'):
             try:
@@ -283,18 +285,12 @@ class Sqlite3InMemoryTestDbs(unittest.TestCase):
                     },
                 })
                 other = db.connections['other']
-                self.assertEqual(other.features.supports_transactions, None)
+                self.assertIsNone(other.features.supports_transactions)
                 DjangoTestSuiteRunner(verbosity=0).setup_databases()
+                msg = "DATABASES setting '%s' option set to sqlite3's ':memory:' value shouldn't interfere with transaction support detection." % option
                 # Transaction support should be properly initialised for the 'other' DB
-                self.assertNotEqual(
-                    other.features.supports_transactions,
-                    None,
-                    "DATABASES setting '%s' option set to sqlite3's ':memory:' value causes problems with transaction support detection." % option
-                )
+                self.assertIsNotNone(other.features.supports_transactions, msg)
                 # And all the DBs should report that they support transactions
-                self.assertTrue(
-                    connections_support_transactions(),
-                    "DATABASES setting '%s' option set to sqlite3's ':memory:' value causes problems with transaction support detection." % option
-                )
+                self.assertTrue(connections_support_transactions(), msg)
             finally:
                 db.connections = old_db_connections