patch 8.1.1091: MS-Windows: cannot use multi-byte chars in environment var commit https://github.com/vim/vim/commit/f0908e6fe18943ad4453d7d6772fa43049aff4bc Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 30 20:11:50 2019 +0100 patch 8.1.1091: MS-Windows: cannot use multi-byte chars in environment var Problem: MS-Windows: cannot use multi-byte chars in environment var. Solution: Use the wide API. (Ken Takata, closes https://github.com/vim/vim/issues/4008)

func Test_empty_buffer()
  new
  insert
a
b
c
d
.
  call assert_equal(1, line("''"))
  bwipe!
endfunc