patch 8.2.0775: not easy to call a Vim function from Lua Commit: https://github.com/vim/vim/commit/eb04f0893afe01faff272ef84c70d8cc16d8e80a Author: Bram Moolenaar <Bram@vim.org> Date: Sun May 17 14:32:35 2020 +0200 patch 8.2.0775: not easy to call a Vim function from Lua Problem: Not easy to call a Vim function from Lua. Solution: Add vim.call() and vim.fn(). (Prabir Shrestha, closes https://github.com/vim/vim/issues/6063)

" Tests for :undo

func Test_ex_undo()
  new ex-undo
  setlocal ul=10
  exe "normal ione\n\<Esc>"
  setlocal ul=10
  exe "normal itwo\n\<Esc>"
  setlocal ul=10
  exe "normal ithree\n\<Esc>"
  call assert_equal(4, line('$'))
  undo
  call assert_equal(3, line('$'))
  undo 1
  call assert_equal(2, line('$'))
  undo 0
  call assert_equal(1, line('$'))
  quit!
endfunc