Run tests on all children images

tests/base-notebook/test_notebook.py

@@ -0,0 +1,17 @@
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+
+import requests
+from conftest import TrackedContainer, find_free_port
+
+
+def test_secured_server(
+    container: TrackedContainer, http_client: requests.Session
+) -> None:
+    """Notebook server should eventually request user login."""
+    host_port = find_free_port()
+    container.run_detached(ports={"8888/tcp": host_port})
+    resp = http_client.get(f"http://localhost:{host_port}")
+    resp.raise_for_status()
+    assert "login_submit" in resp.text, "User login not requested"