import subprocess, sys, os

for fs_encoding in ('latin-1', 'utf-8'):
    env = os.environ.copy()
    env['PYTHONFSENCODING'] = fs_encoding
    code = '; '.join((
        'import subprocess, sys',
        r"args = [sys.executable, '-c', 'import sys; print(ascii(sys.argv))', 'U+00E9 = \xe9']",
        'subprocess.Popen(args).wait()'))
    args = [sys.executable, '-c', code]
    stdout, stderr = subprocess.Popen(args, stdout=subprocess.PIPE, env=env).communicate()
    stdout = stdout.rstrip()
    assert stdout == b"['-c', 'U+00E9 = \\xe9']", (stdout, fs_encoding)