commit https://github.com/vim/vim/commit/6835dc61aebca2b602d85a9d63c449ace58683b4 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jul 24 17:33:05 2016 +0200 patch 7.4.2100 Problem: "cgn" and "dgn" do not work correctly with a single character match and the replacement includes the searched pattern. (John Beckett) Solution: If the match is found in the wrong column try in the next column. Turn the test into new style. (Christian Brabandt)

" 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