patch 8.2.4487: Vim9: cannot compare with v:null Commit: https://github.com/vim/vim/commit/7a2222487507eb13cccdb9a66397092775d62b8c Author: Bram Moolenaar <Bram@vim.org> Date: Tue Mar 1 19:23:24 2022 +0000 patch 8.2.4487: Vim9: cannot compare with v:null Problem: Vim9: cannot compare with v:null. Solution: Allow comparing anything with v:null. (closes https://github.com/vim/vim/issues/9866)

" 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