Fixed #18334 -- Fixed detection of supports_stddev backend feature.

Thanks to Michael Manfre for the report and Anssi Kääriäinen for the
review.

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/regressiontests/backends/tests.py b/tests/regressiontests/backends/tests.py
index eec817c5a2..10e69b65c1 100644
--- a/tests/regressiontests/backends/tests.py
+++ b/tests/regressiontests/backends/tests.py
@@ -397,6 +397,12 @@ class BackendTestCase(TestCase):
         self.assertTrue(hasattr(connection.ops, 'connection'))
         self.assertEqual(connection, connection.ops.connection)
 
+    def test_supports_needed_confirm(self):
+        connection.features.confirm()
+        self.assertIn(connection.features.supports_transactions, (True, False))
+        self.assertIn(connection.features.supports_stddev, (True, False))
+        self.assertIn(connection.features.can_introspect_foreign_keys, (True, False))
+
     def test_duplicate_table_error(self):
         """ Test that creating an existing table returns a DatabaseError """
         cursor = connection.cursor()