Reorganized backends tests.

tests/backends/base/test_base.py

@@ -0,0 +1,32 @@
+from django.db import DEFAULT_DB_ALIAS, connection, connections
+from django.db.backends.base.base import BaseDatabaseWrapper
+from django.test import SimpleTestCase
+
+
+class DatabaseWrapperTests(SimpleTestCase):
+
+    def test_initialization_class_attributes(self):
+        """
+        The "initialization" class attributes like client_class and
+        creation_class should be set on the class and reflected in the
+        corresponding instance attributes of the instantiated backend.
+        """
+        conn = connections[DEFAULT_DB_ALIAS]
+        conn_class = type(conn)
+        attr_names = [
+            ('client_class', 'client'),
+            ('creation_class', 'creation'),
+            ('features_class', 'features'),
+            ('introspection_class', 'introspection'),
+            ('ops_class', 'ops'),
+            ('validation_class', 'validation'),
+        ]
+        for class_attr_name, instance_attr_name in attr_names:
+            class_attr_value = getattr(conn_class, class_attr_name)
+            self.assertIsNotNone(class_attr_value)
+            instance_attr_value = getattr(conn, instance_attr_name)
+            self.assertIsInstance(instance_attr_value, class_attr_value)
+
+    def test_initialization_display_name(self):
+        self.assertEqual(BaseDatabaseWrapper.display_name, 'unknown')
+        self.assertNotEqual(connection.display_name, 'unknown')