Made sure global settings are changed in test db creation

There was an assumption that changing connection.settings_dict changed
also the settings.DATABASES values. This assumption is now gone.

django/db/backends/creation.py

@@ -281,6 +281,7 @@ class BaseDatabaseCreation(object):
         self._create_test_db(verbosity, autoclobber)
 
         self.connection.close()
+        settings.DATABASES[self.connection.alias]["NAME"] = test_database_name
         self.connection.settings_dict["NAME"] = test_database_name
 
         # Report syncdb messages at one level lower than that requested.

django/db/backends/oracle/creation.py

@@ -104,10 +104,12 @@ class DatabaseCreation(BaseDatabaseCreation):
                     print("Tests cancelled.")
                     sys.exit(1)
 
-        self.connection.settings_dict['SAVED_USER'] = self.connection.settings_dict['USER']
-        self.connection.settings_dict['SAVED_PASSWORD'] = self.connection.settings_dict['PASSWORD']
-        self.connection.settings_dict['TEST_USER'] = self.connection.settings_dict['USER'] = TEST_USER
-        self.connection.settings_dict['PASSWORD'] = TEST_PASSWD
+        from django.db import settings
+        real_settings = settings.DATABASES[self.connection.alias]
+        real_settings['SAVED_USER'] = self.connection.settings_dict['SAVED_USER'] = self.connection.settings_dict['USER']
+        real_settings['SAVED_PASSWORD'] = self.connection.settings_dict['SAVED_PASSWORD'] = self.connection.settings_dict['PASSWORD']
+        real_settings['TEST_USER'] = real_settings['USER'] = self.connection.settings_dict['TEST_USER'] = self.connection.settings_dict['USER'] = TEST_USER
+        real_settings['PASSWORD'] = self.connection.settings_dict['PASSWORD'] = TEST_PASSWD
 
         return self.connection.settings_dict['NAME']