Run tests in parallel

base-notebook/test/test_container_options.py

@@ -7,7 +7,7 @@ import logging
 import pytest  # type: ignore
 import requests
 
-from conftest import TrackedContainer
+from conftest import TrackedContainer, find_free_port
 
 LOGGER = logging.getLogger(__name__)
 
@@ -15,11 +15,11 @@ LOGGER = logging.getLogger(__name__)
 def test_cli_args(container: TrackedContainer, http_client: requests.Session) -> None:
     """Container should respect notebook server command line args
     (e.g., disabling token security)"""
+    host_port = find_free_port()
     running_container = container.run_detached(
         command=["start-notebook.sh", "--NotebookApp.token=''"],
-        ports={"8888/tcp": None},
+        ports={"8888/tcp": host_port},
     )
-    host_port = container.get_host_port("8888/tcp")
     resp = http_client.get(f"http://localhost:{host_port}")
     resp.raise_for_status()
     logs = running_container.logs().decode("utf-8")
@@ -37,11 +37,11 @@ def test_unsigned_ssl(
     """Container should generate a self-signed SSL certificate
     and notebook server should use it to enable HTTPS.
     """
+    host_port = find_free_port()
     running_container = container.run_detached(
         environment=["GEN_CERT=yes"],
-        ports={"8888/tcp": None},
+        ports={"8888/tcp": host_port},
     )
-    host_port = container.get_host_port("8888/tcp")
     # NOTE: The requests.Session backing the http_client fixture does not retry
     # properly while the server is booting up. An SSL handshake error seems to
     # abort the retry logic. Forcing a long sleep for the moment until I have