# Pastebin xBPcrFQ5
$ .tox/py34/bin/python -m subunit.run discover -t ./ ./tests --list | wc
       2      17   10198

(Pdb) pp list_cmd
'${PYTHON:-python} -m subunit.run discover -t ./ ./tests --list '
(Pdb) import os
(Pdb) os.getcwd()
'/Users/alex_gaynor/projects/openstack-swiftclient'
(Pdb) pp out
b''
(Pdb) pp err
None
(Pdb) pp run_proc.returncode
1