patch 8.0.1510: cannot test if a command causes a beep commit https://github.com/vim/vim/commit/b48e96f61c87a64e38e3ac50732c92a84a4833b8 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Feb 13 12:26:14 2018 +0100 patch 8.0.1510: cannot test if a command causes a beep Problem: Cannot test if a command causes a beep. Solution: Add assert_beeps().

" 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