patch 8.1.0672: the Lua interface doesn't know about v:null commit https://github.com/vim/vim/commit/9067cd6cdfdc0bb869aa7f5d2a6c607ea8255239 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jan 1 00:41:54 2019 +0100 patch 8.1.0672: the Lua interface doesn't know about v:null Problem: The Lua interface doesn't know about v:null. Solution: Add Lua support for v:null. (Uji, closes https://github.com/vim/vim/issues/3744)

" Settings for test script execution
" Always use "sh", don't use the value of "$SHELL".
set shell=sh

" Only when the +eval feature is present. 
if 1
  " While some tests overwrite $HOME to prevent them from polluting user files,
  " we need to remember the original value so that we can tell external systems
  " where to ask about their own user settings.
  let g:tester_HOME = $HOME
endif

source setup.vim