Here's the same thing written in Elisp for all those Emacs users out there.

;; Ctrl-C t p
;; (global-set-key "\C-ctp" 'toggle-test-plan)

;; or rather, only set this when editing perl code
(eval-after-load "cperl-mode"
  '(add-hook 'cperl-mode-hook
            (lambda ()
              ;; ... other perl only key bindings go here
              (local-set-key "\C-ctp" 'toggle-test-plan)
              ))

(defun toggle-test-plan ()
  "..."
  (interactive)
  (let ((new-pos))
    (save-excursion
      (goto-char (point-min))
      (cond ((re-search-forward "More[ \t]+tests[ \t]*=>[ \t]*" nil t)
             (replace-match "More 'no_plan'; # tests => " t t))
            ((re-search-forward "More[ \t]+'no_plan';[ \t]*#[ \t]*" ni
+l t)
             (replace-match "More " t t)
             (setq new-pos (point)))))
    (if new-pos (goto-char new-pos))))
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