show timestamps in captured logs

for easier debugging of timelines

pytest.ini

@@ -11,6 +11,9 @@ asyncio_default_fixture_loop_scope = module
 # jupyter_server plugin is incompatible with notebook imports
 addopts = -p no:jupyter_server -m 'not browser' --color yes --durations 10 --verbose
 
+log_format = %(asctime)s %(levelname)s %(filename)s:%(lineno)s %(message)s
+log_date_format = %H:%M:%S
+
 python_files = test_*.py
 markers =
     gen_test: marks an async tornado test