patch 8.1.0241: effect of ":tabmove N" is not clear commit https://github.com/vim/vim/commit/7cc596547a582e7bc18d91312eb674906ebdc5c2 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Aug 7 13:14:46 2018 +0200 patch 8.1.0241: effect of ":tabmove N" is not clear Problem: Effect of ":tabmove N" is not clear. Solution: Add a test that shows the behavior. (Christian Brabandt, closes #3288)

" 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