<requires home>
<loop backend anon xfer>
$backend PWD 'CWD subdir' PWD 'CWD ..' PWD 'CWD ..' PWD
<result anon>
257 "/"^M
250 Changed directory.^M
257 "/subdir"^M
250 Changed directory.^M
257 "/"^M
250 Changed directory.^M
257 "/"^M
<result xfer>
257 "/"^M
250 Changed directory.^M
257 "/subdir"^M
250 Changed directory.^M
257 "/"^M
250 Changed directory.^M
257 "/"^M
