commit https://github.com/vim/vim/commit/bdf0bda968a53a55149a4c83a10a60c28e431305 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Mar 30 21:06:57 2016 +0200 patch 7.4.1687 Problem: The channel close_cb option does not work. Solution: Use jo_close_partial instead of jo_err_partial. (Damien)

" Test for joining lines.

func Test_join_with_count()
  new
  call setline(1, ['one', 'two', 'three', 'four'])
  normal J
  call assert_equal('one two', getline(1))
  %del
  call setline(1, ['one', 'two', 'three', 'four'])
  normal 10J
  call assert_equal('one two three four', getline(1))
  quit!
endfunc