diff --git a/testing/jupyterhub_config.py b/testing/jupyterhub_config.py
index 920156e4..10950c02 100644
--- a/testing/jupyterhub_config.py
+++ b/testing/jupyterhub_config.py
@@ -6,23 +6,24 @@ to enable testing without administrative privileges.
 
 c = get_config()  # noqa
 
-from jupyterhub.auth import DummyAuthenticator
-
-c.JupyterHub.authenticator_class = DummyAuthenticator
+c.JupyterHub.authenticator_class = "dummy"
 
 # Optionally set a global password that all users must use
 # c.DummyAuthenticator.password = "your_password"
 
-from jupyterhub.spawner import SimpleLocalProcessSpawner
-
-c.JupyterHub.spawner_class = SimpleLocalProcessSpawner
+c.JupyterHub.spawner_class = "simple"
 
 # only listen on localhost for testing
 c.JupyterHub.bind_url = 'http://127.0.0.1:8000'
 
+# don't cache static files
 c.JupyterHub.tornado_settings = {
     "no_cache_static": True,
 }
 
+c.JupyterHub.allow_named_servers = True
+c.JupyterHub.default_url = "/hub/home"
+
+# make sure admin UI is available and any user can login
 c.JupyterHub.admin_users = {"admin"}
 c.JupyterHub.allow_all = True