commit https://github.com/vim/vim/commit/3ef5bf7d459d6b8a21aaefc80f65448f5a7aa59f Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jun 15 22:41:31 2016 +0200 patch 7.4.1941 Problem: Not all quickfix tests are also done with the location lists. Solution: Test more quickfix code. Use user commands instead of "exe". (Yegappan Lakshmanan)

" 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