Add some typing to tests

datascience-notebook/test/test_julia.py

@@ -2,10 +2,12 @@
 # Distributed under the terms of the Modified BSD License.
 import logging
 
+from conftest import TrackedContainer
+
 LOGGER = logging.getLogger(__name__)
 
 
-def test_julia(container):
+def test_julia(container: TrackedContainer) -> None:
     """Basic julia test"""
     LOGGER.info("Test that julia is correctly installed ...")
     running_container = container.run(