Add a test for connection.database in the connection_created signal.

I contemplated removing the self.database assignment from DatabaseWrapper.init_connection_state() which would have broken this.

Author: timgraham

tests/backend_/test_base.py

@@ -1,5 +1,6 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.db import connection
+from django.db.backends.signals import connection_created
 from django.test import SimpleTestCase, TestCase
 
 from django_mongodb_backend.base import DatabaseWrapper
@@ -21,3 +22,23 @@ def test_set_autocommit(self):
  self.assertIs(connection.get_autocommit(), False)
  connection.set_autocommit(True)
  self.assertIs(connection.get_autocommit(), True)
+
+ def test_connection_created_database_attr(self):
+ """
+ connection.database is available in the connection_created signal.
+ """
+ data = {}
+
+ def receiver(sender, connection, **kwargs): # noqa: ARG001
+ data["database"] = connection.database
+
+ connection_created.connect(receiver)
+ connection.close()
+ # Accessing database implicitly connects.
+ connection.database # noqa: B018
+ self.assertIs(data["database"], connection.database)
+ connection.close()
+ connection_created.disconnect(receiver)
+ data.clear()
+ connection.connect()
+ self.assertEqual(data, {})