commit https://github.com/vim/vim/commit/fc4ad616073a169badfb2b9906fee2844f76f730 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jul 9 15:38:32 2016 +0200 patch 7.4.2007 Problem: Running the tests leaves a viminfo file behind. Solution: Make the viminfo option empty.

" 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