commit https://github.com/vim/vim/commit/cf2d8dee5117b9add3a3f5fc91b3569437e7d359 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Mar 28 21:04:37 2016 +0200 patch 7.4.1674 Problem: The editexisting plugin has to be copied or sourced to be used. Solution: Turn it into a package.

" Test feedkeys() function.

func Test_feedkeys_x_with_empty_string()
  new
  call feedkeys("ifoo\<Esc>")
  call assert_equal('', getline('.'))
  call feedkeys('', 'x')
  call assert_equal('foo', getline('.'))
  quit!
endfunc