patch 8.1.0993: ch_read() may return garbage if terminating NL is missing commit https://github.com/vim/vim/commit/772153f8d85c83e08427d93460a676d7f079f002 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Mar 4 12:09:49 2019 +0100 patch 8.1.0993: ch_read() may return garbage if terminating NL is missing Problem: ch_read() may return garbage if terminating NL is missing. Solution: Add terminating NUL. (Ozaki Kiichi, closes https://github.com/vim/vim/issues/4065)

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