patch 8.1.0679: sign functions do not take buffer argument as documented commit https://github.com/vim/vim/commit/2cbc1a02cb72916dfdbd0d307512c7c3fb766edf Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jan 2 13:40:31 2019 +0100 patch 8.1.0679: sign functions do not take buffer argument as documented Problem: Sign functions do not take buffer argument as documented. Solution: Use get_buf_tv(). (Yegappan Lakshmanan, closes https://github.com/vim/vim/issues/3755)

" 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