commit https://github.com/vim/vim/commit/7280140c08799f683ef31a6c1019e283c3dc13aa Author: Bram Moolenaar <Bram@vim.org> Date: Tue Feb 9 11:37:50 2016 +0100 patch 7.4.1294 Problem: job_stop() only kills the started process. Solution: Send the signal to the process group. (Olaf Dabrunz)

" Settings for test script execution
" Always use "COMMAND.COM", don't use the value of "$SHELL".
set shell=c:\COMMAND.COM shellquote= shellxquote= shellcmdflag=/c shellredir=>
" This is used only when the +eval feature is available.
if executable("cmd.exe")
   set shell=cmd.exe
endif