patch 8.1.0632: using sign group names is inefficient commit https://github.com/vim/vim/commit/7a2d9892b7158edf8dc48e9bcaaae70a40787b37 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Dec 24 20:23:49 2018 +0100 patch 8.1.0632: using sign group names is inefficient Problem: Using sign group names is inefficient. Solution: Store group names in a hash table and use a reference to them. Also remove unnecessary use of ":exe" from the tests. (Yegappan Lakshmanan, closes #3715)

" Test if fnameescape is correct for special chars like !
function! Test_fnameescape()
  let fname = 'Xspa ce'
  let status = v:false
  try
    exe "w! " . fnameescape(fname)
    let status = v:true
  endtry
  call assert_true(status, "Space")
  call delete(fname)

  let fname = 'Xemark!'
  let status = v:false
  try
    exe "w! " . fnameescape(fname)
    let status = v:true
  endtry
  call assert_true(status, "ExclamationMark")
  call delete(fname)
endfunction