patch 8.0.0507: client-server tests fail when $DISPLAY is not set commit https://github.com/vim/vim/commit/a2845b8f5a3058c8c89699771ffd4d69513b097d Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 25 15:20:06 2017 +0100 patch 8.0.0507: client-server tests fail when $DISPLAY is not set Problem: Client-server tests fail when $DISPLAY is not set. Solution: Check for E240 before running the test.

" 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

source setup.vim