patch 8.1.0573: cannot redefine user command without ! in same script commit https://github.com/vim/vim/commit/55d46913084745a48749d7ac4f48930852e1d87e Author: Bram Moolenaar <Bram@vim.org> Date: Sat Dec 8 16:03:28 2018 +0100 patch 8.1.0573: cannot redefine user command without ! in same script Problem: Cannot redefine user command without ! in same script Solution: Allow redefining user command without ! in same script, like with functions.

" 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