Better tests directory structure (#2231)

tests/shared_checks/pluto_check.py

@@ -0,0 +1,31 @@
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+import logging
+import secrets
+import time
+
+import requests
+
+from tests.utils.find_free_port import find_free_port
+from tests.utils.tracked_container import TrackedContainer
+
+LOGGER = logging.getLogger(__name__)
+
+
+def check_pluto_proxy(
+    container: TrackedContainer, http_client: requests.Session
+) -> None:
+    host_port = find_free_port()
+    token = secrets.token_hex()
+    container.run_detached(
+        command=[
+            "start-notebook.py",
+            f"--IdentityProvider.token={token}",
+        ],
+        ports={"8888/tcp": host_port},
+    )
+    # Give the server a bit of time to start
+    time.sleep(2)
+    resp = http_client.get(f"http://localhost:{host_port}/pluto?token={token}")
+    resp.raise_for_status()
+    assert "Pluto.jl notebooks" in resp.text, "Pluto.jl text not found in /pluto page"