test_folder:{
  1. Sort Tests:{
    files_by_date
    files_with_noseqs
    files_with_seqs_at_end
    files_with_seqs_at_start
    files_with_seqs_in_middle
  }
  2. Collect tests:{
    dirs-1st-last-test_1-file
    empty_dir
  }
  3. Path tests
}