Execute(The cspell handler should handle cspell output):
  AssertEqual
  \ [
  \   {
  \     'lnum': 3,
  \     'col': 128,
  \     'end_col': 133,
  \     'type': 'W',
  \     'text': 'Unknown word (Neovim)',
  \   },
  \ ],
  \ ale#handlers#cspell#Handle(bufnr(''),
  \   '/:3:128 - Unknown word (Neovim)'
  \)