commit https://github.com/vim/vim/commit/da59dd5da6440c3410866ed61ce169a2012ba5bd Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jan 5 21:59:58 2016 +0100 patch 7.4.1053 Problem: Insufficient testing for quickfix commands. Solution: Add a new style quickfix test. (Yegappan Lakshmanan)

" 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