tests/various/exec.ys

   1 exec -expect-return 0 -- exit 0
   2 exec -expect-return 27 -- exit 27
   3 exec -expect-stdout nana -expect-stdout api -not-expect-stdout giraffe -- echo "bananapie"
   4
   5 logger -expect error "stdout did have a line" 1
   6 exec -not-expect-stdout giraffe -- echo "giraffe"