patch 9.0.0341: mapset() does not restore <Nop> mapping properly Commit: https://github.com/vim/vim/commit/92a3d20682d46359bb50a452b4f831659e799155 Author: zeertzjq <zeertzjq@outlook.com> Date: Wed Aug 31 16:40:17 2022 +0100 patch 9.0.0341: mapset() does not restore <Nop> mapping properly Problem: mapset() does not restore <Nop> mapping properly. Solution: Use an empty string for <Nop>. (closes https://github.com/vim/vim/issues/11022)

" 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