commit https://github.com/vim/vim/commit/b56195ed00a9a79aa6217cddbeedbc8cc7a5b6d8 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Jul 28 22:53:37 2016 +0200 patch 7.4.2112 Problem: getcompletion(.., 'dir') returns a match with trailing "*" when there are no matches. (Chdiza) Solution: Return an empty list when there are no matches. Add a trailing slash to directories. (Yegappan Lakshmanan) Add tests for no matches. (closes #947)

" Test 'autochdir' behavior

if !exists("+autochdir")
  finish
endif

func Test_set_filename()
  call test_autochdir()
  set acd
  new
  w samples/Xtest
  call assert_equal("Xtest", expand('%'))
  call assert_equal("samples", substitute(getcwd(), '.*/\(\k*\)', '\1', ''))
  bwipe!
  set noacd
  call delete('samples/Xtest')
endfunc