test_posix.TestPosixSpawnP.test_no_such_executable() fails with NotADirectoryError on Debian

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-02-16.17:15:32.880>
labels = ['tests', '3.8', 'type-bug', 'library']
title = 'test_posix.TestPosixSpawnP.test_no_such_executable() fails with NotADirectoryError on Debian'
updated_at = <Date 2020-02-29.22:29:38.459>
user = 'https://github.com/JaguarDown'

bugs.python.org fields:

activity = <Date 2020-02-29.22:29:38.459>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)', 'Tests']
creation = <Date 2020-02-16.17:15:32.880>
creator = 'jaguardown'
dependencies = []
files = []
hgrepos = []
issue_num = 39653
keywords = []
message_count = 5.0
messages = ['362084', '362449', '362555', '363021', '363022']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'vstinner', 'larry', 'jaguardown']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39653'
versions = ['Python 3.8']