* setup test driven development: done
* execute tests using gash: done
* parsing posix shell: nested "'""'": done
* globbing: done
* job control: done
* substitution: done
* readline: prompt2: in progress
* pipe: in progress: mix built-in with process
* compound: case, while, until
* expansion: done
* alias:
* iohere:
* redirection:
* posix compliance: