func Test_setbufvar_options()
  " This tests that aucmd_prepbuf() and aucmd_restbuf() properly restore the
  " window layout.
  call assert_equal(1, winnr('$'))
  split dummy_preview
  resize 2
  set winfixheight winfixwidth
  let prev_id = win_getid()

  wincmd j
  let wh = winheight('.')
  let dummy_buf = bufnr('dummy_buf1', v:true)
  call setbufvar(dummy_buf, '&buftype', 'nofile')
  execute 'belowright vertical split #' . dummy_buf
  call assert_equal(wh, winheight('.'))
  let dum1_id = win_getid()

  wincmd h
  let wh = winheight('.')
  let dummy_buf = bufnr('dummy_buf2', v:true)
  call setbufvar(dummy_buf, '&buftype', 'nofile')
  execute 'belowright vertical split #' . dummy_buf
  call assert_equal(wh, winheight('.'))

  bwipe!
  call win_gotoid(prev_id)
  bwipe!
  call win_gotoid(dum1_id)
  bwipe!
endfunc