stg pop &&
[ "$(echo $(cat x.txt))" = "x0 x1" ] &&
[ "$(echo $(cat foo/y.txt))" = "y0 y1" ] &&
stg new extra -m extra &&
echo extra >> extra.txt &&
stg pop &&
[ "$(echo $(cat x.txt))" = "x0 x1" ] &&
[ "$(echo $(cat foo/y.txt))" = "y0 y1" ] &&
stg new extra -m extra &&
echo extra >> extra.txt &&