let g:fold_levels = {}
function! JFolds(lnum)
  let line = getline(a:lnum)
  let next_line = getline(a:lnum + 1)
  let g:fold_levels.line = line
  let g:fold_levels.next = next_line
  if line =~ '^\s\+\%(describe\|it\)'
    let lead = matchstr(line, '^\s\+')
    let g:fold_levels.lead = len(lead)
    let g:fold_levels[lead] = lead
    echom '1:a1 ' . string(g:fold_levels)
    return 'a1'
  elseif line =~ '^\s\+});.*'
    let lead = matchstr(line, '^\s\+\ze\});')
    let g:fold_levels.lead = len(lead)
    if has_key(g:fold_levels, lead)
      call remove(g:fold_levels, lead)
      echom '2:s1 ' . string(g:fold_levels)
      return 's1'
    endif
    echom '3: = ' . string(g:fold_levels)
    return '='
  else
    echom '4: = ' . string(g:fold_levels)
    return '='
  endif
endfunction

set fdm=expr
set fde=JFolds(v:lnum)
set debug=msg