commit https://github.com/vim/vim/commit/74b738d414b2895b3365e26ae3b7792eb82ccf47 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Sep 29 18:08:33 2015 +0200 patch 7.4.889 Problem: Triggering OptionSet from setwinvar() isn't tested. Solution: Add a test. (Christian Brabandt)

" 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