patch 8.0.0396: 'balloonexpr' only works synchronously commit https://github.com/vim/vim/commit/59716a27bd5c6c64def6c3ca430ff1246deae749 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Mar 1 20:32:44 2017 +0100 patch 8.0.0396: 'balloonexpr' only works synchronously Problem: 'balloonexpr' only works synchronously. Solution: Add balloon_show(). (Jusufadis Bakamovic, closes https://github.com/vim/vim/issues/1449)

" 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('.'))

  " check it goes back to normal mode immediately.
  call feedkeys('i', 'x')
  call assert_equal('foo', getline('.'))
  quit!
endfunc