yasnippet-tests.el

;;; yasnippet-tests.el --- some yasnippet tests

;; Copyright (C) 2012  João Távora

;; Author: João Távora <joaot@siscog.pt>
;; Keywords: emulations, convenience

;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with this program.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Test basic snippet mechanics and the loading system

;;; Code:

(require 'yasnippet)
(require 'ert)
(require 'ert-x)


;;; Snippet mechanics

(defun yas--buffer-contents ()
  (buffer-substring-no-properties (point-min) (point-max)))

(ert-deftest field-navigation ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "${1:brother} from another ${2:mother}")
    (should (string= (yas--buffer-contents)
                     "brother from another mother"))

    (should (looking-at "brother"))
    (ert-simulate-command '(yas-next-field-or-maybe-expand))
    (should (looking-at "mother"))
    (ert-simulate-command '(yas-prev-field))
    (should (looking-at "brother"))))

(ert-deftest simple-mirror ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "${1:brother} from another $1")
    (should (string= (yas--buffer-contents)
                     "brother from another brother"))
    (ert-simulate-command `(yas-mock-insert "bla"))
    (should (string= (yas--buffer-contents)
                     "bla from another bla"))))

(ert-deftest mirror-with-transformation ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "${1:brother} from another ${1:$(upcase yas-text)}")
    (should (string= (yas--buffer-contents)
                     "brother from another BROTHER"))
    (ert-simulate-command `(yas-mock-insert "bla"))
    (should (string= (yas--buffer-contents)
                     "bla from another BLA"))))

(ert-deftest primary-field-transformation ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (let ((snippet "${1:$$(upcase yas/text)}${1:$(concat \"bar\" yas/text)}"))
      (yas-expand-snippet snippet)
      (should (string= (yas--buffer-contents) "bar"))
      (ert-simulate-command `(yas-mock-insert "foo"))
      (should (string= (yas--buffer-contents) "FOObarFOO")))))

(ert-deftest nested-placeholders-kill-superfield ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "brother from ${2:another ${3:mother}}!")
    (should (string= (yas--buffer-contents)
                     "brother from another mother!"))
    (ert-simulate-command `(yas-mock-insert "bla"))
    (should (string= (yas--buffer-contents)
                     "brother from bla!"))))

(ert-deftest nested-placeholders-use-subfield ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "brother from ${2:another ${3:mother}}!")
    (ert-simulate-command '(yas-next-field-or-maybe-expand))
    (ert-simulate-command `(yas-mock-insert "bla"))
    (should (string= (yas--buffer-contents)
                     "brother from another bla!"))))

(ert-deftest mirrors-adjacent-to-fields-with-nested-mirrors ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "<%= f.submit \"${1:Submit}\"${2:$(and (yas-text) \", :disable_with => '\")}${2:$1ing...}${2:$(and (yas-text) \"'\")} %>")
    (should (string= (yas--buffer-contents)
                     "<%= f.submit \"Submit\", :disable_with => 'Submiting...' %>"))
    (ert-simulate-command `(yas-mock-insert "Send"))
    (should (string= (yas--buffer-contents)
                     "<%= f.submit \"Send\", :disable_with => 'Sending...' %>"))))

(ert-deftest deep-nested-mirroring-issue-351 ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "${1:FOOOOOOO}${2:$1}${3:$2}${4:$3}")
    (ert-simulate-command `(yas-mock-insert "abc"))
    (should (string= (yas--buffer-contents) "abcabcabcabc"))))

;; (ert-deftest in-snippet-undo ()
;;   (with-temp-buffer
;;     (yas-minor-mode 1)
;;     (yas-expand-snippet "brother from ${2:another ${3:mother}}!")
;;     (ert-simulate-command '(yas-next-field-or-maybe-expand))
;;     (ert-simulate-command `(yas-mock-insert "bla"))
;;     (ert-simulate-command '(undo))
;;     (should (string= (yas--buffer-contents)
;;                      "brother from another mother!"))))


;;; Snippet expansion and character escaping
;;; Thanks to @zw963 (Billy) for the testing
;;;
(ert-deftest escape-dollar ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "bla\\${1:bla}ble")
    (should (string= (yas--buffer-contents) "bla${1:bla}ble"))))

(ert-deftest escape-closing-brace ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "bla${1:bla\\}}ble")
    (should (string= (yas--buffer-contents) "blabla}ble"))
    (should (string= (yas-field-value 1) "bla}"))))

(ert-deftest escape-backslashes ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "bla\\ble")
    (should (string= (yas--buffer-contents) "bla\\ble"))))

(ert-deftest escape-backquotes ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "bla`(upcase \"foo\\`bar\")`ble")
    (should (string= (yas--buffer-contents) "blaFOO`BARble"))))

(ert-deftest escape-some-elisp-with-strings ()
  "elisp with strings and unbalance parens inside it"
  (with-temp-buffer
    (yas-minor-mode 1)
    ;; The rules here is: to output a literal `"' you need to escape
    ;; it with one backslash. You don't need to escape them in
    ;; embedded elisp.
    (yas-expand-snippet "soon \\\"`(concat (upcase \"(my arms\")\"\\\" were all around her\")`")
    (should (string= (yas--buffer-contents) "soon \"(MY ARMS\" were all around her"))))

(ert-deftest escape-some-elisp-with-backslashes ()
  (with-temp-buffer
    (yas-minor-mode 1)
    ;; And the rule here is: to output a literal `\' inside a string
    ;; inside embedded elisp you need a total of six `\'
    (yas-expand-snippet "bla`(upcase \"hey\\\\\\yo\")`ble")
    (should (string= (yas--buffer-contents) "blaHEY\\YOble"))))

(ert-deftest be-careful-when-escaping-in-yas-selected-text ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (let ((yas/selected-text "He\\\\o world!"))
      (yas-expand-snippet "Look ma! `(yas/selected-text)`")
      (should (string= (yas--buffer-contents) "Look ma! He\\\\o world!")))
    (yas-exit-all-snippets)
    (erase-buffer)
    (let ((yas/selected-text "He\"o world!"))
      (yas-expand-snippet "Look ma! `(yas/selected-text)`")
      (should (string= (yas--buffer-contents) "Look ma! He\"o world!")))
    (yas-exit-all-snippets)
    (erase-buffer)
    (let ((yas/selected-text "He\"\)\\o world!"))
      (yas-expand-snippet "Look ma! `(yas/selected-text)`")
      (should (string= (yas--buffer-contents) "Look ma! He\"\)\\o world!")))
    (yas-exit-all-snippets)
    (erase-buffer)))

(ert-deftest be-careful-when-escaping-in-yas-selected-text-2 ()
  (with-temp-buffer
    (let ((yas/selected-text "He)}o world!"))
      (yas-expand-snippet "Look ma! ${1:`(yas/selected-text)`} OK?")
      (should (string= (yas--buffer-contents) "Look ma! He)}o world! OK?")))))

(ert-deftest example-for-issue-271 ()
  (with-temp-buffer
    (yas-minor-mode 1)
    (let ((yas-selected-text "aaa")
          (snippet "if ${1:condition}\n`yas/selected-text`\nelse\n$3\nend"))
      (yas-expand-snippet snippet)
      (yas-next-field)
      (ert-simulate-command `(yas-mock-insert "bbb"))
      (should (string= (yas--buffer-contents) "if condition\naaa\nelse\nbbb\nend")))))

(ert-deftest another-example-for-issue-271 ()
  ;; expect this to fail in batch mode since `region-active-p' doesn't
  ;; used by `yas-expand-snippet' doesn't make sense in that context.
  ;;
  :expected-result (if noninteractive
                       :failed
                     :passed)
  (with-temp-buffer
    (yas-minor-mode 1)
    (let ((snippet "\\${${1:1}:`yas/selected-text`}"))
      (insert "aaabbbccc")
      (set-mark 4)
      (goto-char 7)
      (yas-expand-snippet snippet)
      (should (string= (yas--buffer-contents) "aaa${1:bbb}ccc")))))

(ert-deftest string-match-with-subregexp-in-embedded-elisp ()
  (with-temp-buffer
    (yas-minor-mode 1)
    ;; the rule here is: To use regexps in embedded `(elisp)` expressions, write
    ;; it like you would normal elisp, i.e. no need to escape the backslashes.
    (let ((snippet "`(if (string-match \"foo\\\\(ba+r\\\\)foo\" \"foobaaaaaaaaaarfoo\")
                         \"ok\"
                         \"fail\")`"))
      (yas-expand-snippet snippet))
    (should (string= (yas--buffer-contents) "ok"))))

(ert-deftest string-match-with-subregexp-in-mirror-transformations ()
  (with-temp-buffer
    (yas-minor-mode 1)
    ;; the rule here is: To use regexps in embedded `(elisp)` expressions,
    ;; escape backslashes once, i.e. to use \\( \\) constructs, write \\\\( \\\\).
    (let ((snippet "$1${1:$(if (string-match \"foo\\\\\\\\(ba+r\\\\\\\\)baz\" yas/text)
                                \"ok\"
                                \"fail\")}"))
      (yas-expand-snippet snippet)
      (should (string= (yas--buffer-contents) "fail"))
      (ert-simulate-command `(yas-mock-insert "foobaaar"))
      (should (string= (yas--buffer-contents) "foobaaarfail"))
      (ert-simulate-command `(yas-mock-insert "baz"))
      (should (string= (yas--buffer-contents) "foobaaarbazok")))))


;;; Misc tests
;;;
(ert-deftest protection-overlay-no-cheating ()
  "Protection overlays at the very end of the buffer are dealt
  with by cheatingly inserting a newline!

TODO: correct this bug!"
  :expected-result :failed
  (with-temp-buffer
    (yas-minor-mode 1)
    (yas-expand-snippet "${2:brother} from another ${1:mother}")
    (should (string= (yas--buffer-contents)
                     "brother from another mother") ;; no newline should be here!
            )))

;;; Loading
;;;
(defmacro yas-with-overriden-buffer-list (&rest body)
  (let ((saved-sym (gensym)))
    `(let ((,saved-sym (symbol-function 'buffer-list)))
       (yas--with-temporary-redefinitions
           ((buffer-list ()
                         (remove-if #'(lambda (buf)
                                        (with-current-buffer buf
                                          (eq major-mode 'lisp-interaction-mode)))
                                    (funcall ,saved-sym))))
         ,@body))))

(defmacro yas-with-some-interesting-snippet-dirs (&rest body)
  `(yas-saving-variables
    (yas-with-overriden-buffer-list
     (yas-with-snippet-dirs
       '((".emacs.d/snippets"
          ("c-mode"
           (".yas-parents" . "cc-mode")
           ("printf" . "printf($1);"))  ;; notice the overriding for issue #281
          ("emacs-lisp-mode" ("ert-deftest" . "(ert-deftest ${1:name} () $0)"))
          ("lisp-interaction-mode" (".yas-parents" . "emacs-lisp-mode")))
         ("library/snippets"
          ("c-mode"
           (".yas-parents" . "c++-mode")
           ("printf" . "printf"))
          ("cc-mode" ("def" . "# define"))
          ("emacs-lisp-mode" ("dolist" . "(dolist)"))
          ("lisp-interaction-mode" ("sc" . "brother from another mother"))))
       ,@body))))

(ert-deftest basic-jit-loading ()
  "Test basic loading and expansion of snippets"
  (yas-with-some-interesting-snippet-dirs
   (yas-reload-all)
   (yas--basic-jit-loading-1)))

(ert-deftest basic-jit-loading-with-compiled-snippets ()
  "Test basic loading and expansion of snippets"
  (yas-with-some-interesting-snippet-dirs
   (yas-reload-all)
   (yas-recompile-all)
   (yas--with-temporary-redefinitions ((yas--load-directory-2
                                        (&rest dummies)
                                        (declare (ignore dummies))
                                        (ert-fail "yas--load-directory-2 shouldn't be called when snippets have been compiled")))
     (yas-reload-all)
     (yas--basic-jit-loading-1))))

(ert-deftest loading-with-cyclic-parenthood ()
  "Test loading when cyclic parenthood is setup."
  (yas-saving-variables
   (yas-with-snippet-dirs '((".emacs.d/snippets"
                             ("c-mode"
                              (".yas-parents" . "cc-mode"))
                             ("cc-mode"
                              (".yas-parents" . "yet-another-c-mode"))
                             ("yet-another-c-mode"
                              (".yas-parents" . "c-mode"))))
     (yas-reload-all)
     (condition-case nil
         (yas--all-parents 'c-mode)
       (error
        (ert-fail "cyclic parenthood test failed"))))))

(defun yas--basic-jit-loading-1 (&optional compile)
  (with-temp-buffer
    (should (= 4 (hash-table-count yas--scheduled-jit-loads)))
    (should (= 0 (hash-table-count yas--tables)))
    (lisp-interaction-mode)
    (yas-minor-mode 1)
    (should (= 2 (hash-table-count yas--scheduled-jit-loads)))
    (should (= 2 (hash-table-count yas--tables)))
    (should (= 1 (hash-table-count (yas--table-uuidhash (gethash 'lisp-interaction-mode yas--tables)))))
    (should (= 2 (hash-table-count (yas--table-uuidhash (gethash 'emacs-lisp-mode yas--tables)))))
    (yas-should-expand '(("sc" . "brother from another mother")
                         ("dolist" . "(dolist)")
                         ("ert-deftest" . "(ert-deftest name () )")))
    (c-mode)
    (yas-minor-mode 1)
    (should (= 0 (hash-table-count yas--scheduled-jit-loads)))
    (should (= 4 (hash-table-count yas--tables)))
    (should (= 1 (hash-table-count (yas--table-uuidhash (gethash 'c-mode yas--tables)))))
    (should (= 1 (hash-table-count (yas--table-uuidhash (gethash 'cc-mode yas--tables)))))
    (yas-should-expand '(("printf" . "printf();")
                         ("def" . "# define")))
    (yas-should-not-expand '("sc" "dolist" "ert-deftest"))))


;;; Menu
;;;
(defmacro yas-with-even-more-interesting-snippet-dirs (&rest body)
  `(yas-saving-variables
    (yas-with-snippet-dirs
      `((".emacs.d/snippets"
         ("c-mode"
          (".yas-make-groups" . "")
          ("printf" . "printf($1);")
          ("foo-group-a"
           ("fnprintf" . "fprintf($1);")
           ("snprintf" . "snprintf($1);"))
          ("foo-group-b"
           ("strcmp" . "strecmp($1);")
           ("strcasecmp" . "strcasecmp($1);")))
         ("lisp-interaction-mode"
          ("ert-deftest" . "# group: barbar\n# --\n(ert-deftest ${1:name} () $0)"))
         ("fancy-mode"
          ("a-guy" . "# uuid: 999\n# --\nyo!")
          ("a-sir" . "# uuid: 12345\n# --\nindeed!")
          ("a-lady" . "# uuid: 54321\n# --\noh-la-la!")
          ("a-beggar" . "# uuid: 0101\n# --\narrrgh!")
          ("an-outcast" . "# uuid: 666\n# --\narrrgh!")
          (".yas-setup.el" . , (pp-to-string
                                '(yas-define-menu 'fancy-mode
                                                  '((yas-ignore-item "0101")
                                                    (yas-item "999")
                                                    (yas-submenu "sirs"
                                                                 ((yas-item "12345")))
                                                    (yas-submenu "ladies"
                                                                 ((yas-item "54321"))))
                                                  '("666")))))))
      ,@body)))

(ert-deftest test-yas-define-menu ()
  (let ((yas-use-menu t))
    (yas-with-even-more-interesting-snippet-dirs
     (yas-reload-all 'no-jit)
     (let ((menu (cdr (gethash 'fancy-mode yas--menu-table))))
       (should (eql 4 (length menu)))
       (dolist (item '("a-guy" "a-beggar"))
         (should (find item menu :key #'third :test #'string=)))
       (should-not (find "an-outcast" menu :key #'third :test #'string=))
       (dolist (submenu '("sirs" "ladies"))
         (should (keymapp
                  (fourth
                   (find submenu menu :key #'third :test #'string=)))))
       ))))

(ert-deftest test-group-menus ()
  "Test group-based menus using .yas-make-groups and the group directive"
  (let ((yas-use-menu t))
    (yas-with-even-more-interesting-snippet-dirs
     (yas-reload-all 'no-jit)
     ;; first the subdir-based groups
     ;;
     (let ((menu (cdr (gethash 'c-mode yas--menu-table))))
       (should (eql 3 (length menu)))
       (dolist (item '("printf" "foo-group-a" "foo-group-b"))
         (should (find item menu :key #'third :test #'string=)))
       (dolist (submenu '("foo-group-a" "foo-group-b"))
         (should (keymapp
                  (fourth
                   (find submenu menu :key #'third :test #'string=))))))
     ;; now group directives
     ;;
     (let ((menu (cdr (gethash 'lisp-interaction-mode yas--menu-table))))
       (should (eql 1 (length menu)))
       (should (find "barbar" menu :key #'third :test #'string=))
       (should (keymapp
                (fourth
                 (find "barbar" menu :key #'third :test #'string=))))))))

(ert-deftest test-group-menus-twisted ()
  "Same as similarly named test, but be mean.

TODO: be meaner"
  (let ((yas-use-menu t))
    (yas-with-even-more-interesting-snippet-dirs
     ;; add a group directive conflicting with the subdir and watch
     ;; behaviour
     (with-temp-buffer
       (insert "# group: foo-group-c\n# --\nstrecmp($1)")
       (write-region nil nil (concat (first (yas-snippet-dirs))
                                     "/c-mode/foo-group-b/strcmp")))
     (yas-reload-all 'no-jit)
     (let ((menu (cdr (gethash 'c-mode yas--menu-table))))
       (should (eql 4 (length menu)))
       (dolist (item '("printf" "foo-group-a" "foo-group-b" "foo-group-c"))
         (should (find item menu :key #'third :test #'string=)))
       (dolist (submenu '("foo-group-a" "foo-group-b" "foo-group-c"))
         (should (keymapp
                  (fourth
                   (find submenu menu :key #'third :test #'string=))))))
     ;; delete the .yas-make-groups file and watch behaviour
     ;;
     (delete-file (concat (first (yas-snippet-dirs))
                          "/c-mode/.yas-make-groups"))
     (yas-reload-all 'no-jit)
     (let ((menu (cdr (gethash 'c-mode yas--menu-table))))
       (should (eql 5 (length menu))))
     ;; Change a group directive and reload
     ;;
     (let ((menu (cdr (gethash 'lisp-interaction-mode yas--menu-table))))
       (should (find "barbar" menu :key #'third :test #'string=)))

     (with-temp-buffer
       (insert "# group: foofoo\n# --\n(ert-deftest ${1:name} () $0)")
       (write-region nil nil (concat (first (yas-snippet-dirs))
                                     "/lisp-interaction-mode/ert-deftest")))
     (yas-reload-all 'no-jit)
     (let ((menu (cdr (gethash 'lisp-interaction-mode yas--menu-table))))
       (should (eql 1 (length menu)))
       (should (find "foofoo" menu :key #'third :test #'string=))
       (should (keymapp
                (fourth
                 (find "foofoo" menu :key #'third :test #'string=))))))))


;;; The infamous and problematic tab keybinding
;;;
(ert-deftest test-yas-tab-binding ()
  (with-temp-buffer
    (yas-minor-mode -1)
    (should (not (eq (key-binding (yas--read-keybinding "<tab>")) 'yas-expand)))
    (yas-minor-mode 1)
    (should (eq (key-binding (yas--read-keybinding "<tab>")) 'yas-expand))
    (yas-expand-snippet "$1 $2 $3")
    (should (eq (key-binding [(tab)]) 'yas-next-field-or-maybe-expand))
    (should (eq (key-binding (kbd "TAB")) 'yas-next-field-or-maybe-expand))
    (should (eq (key-binding [(shift tab)]) 'yas-prev-field))
    (should (eq (key-binding [backtab]) 'yas-prev-field))))

(ert-deftest test-rebindings ()
  (unwind-protect
      (progn
        (define-key yas-minor-mode-map [tab] nil)
        (define-key yas-minor-mode-map (kbd "TAB") nil)
        (define-key yas-minor-mode-map (kbd "SPC") 'yas-expand)
        (with-temp-buffer
          (yas-minor-mode 1)
          (should (not (eq (key-binding (yas--read-keybinding "TAB")) 'yas-expand)))
          (should (eq (key-binding (yas--read-keybinding "SPC")) 'yas-expand))
          (yas-reload-all)
          (should (not (eq (key-binding (yas--read-keybinding "TAB")) 'yas-expand)))
          (should (eq (key-binding (yas--read-keybinding "SPC")) 'yas-expand))))
    (setcdr yas-minor-mode-map (cdr (yas--init-minor-keymap)))))

(ert-deftest test-yas-in-org ()
  (with-temp-buffer
    (org-mode)
    (yas-minor-mode 1)
    (should (eq (key-binding [(tab)]) 'yas-expand))
    (should (eq (key-binding (kbd "TAB")) 'yas-expand))))


;;; Helpers
;;;
(defun yas/ert ()
  (interactive)
  (with-temp-buffer
    (yas--with-temporary-redefinitions
        ((message (&rest args)        ;
                  (declare (ignore args))
                  nil))
      (ert t (buffer-name (current-buffer)))
      (princ (buffer-string)))))


(defun yas-should-expand (keys-and-expansions)
  (dolist (key-and-expansion keys-and-expansions)
    (yas-exit-all-snippets)
    (erase-buffer)
    (insert (car key-and-expansion))
    (let ((yas-fallback-behavior nil))
      (ert-simulate-command '(yas-expand)))
    (should (string= (yas--buffer-contents) (cdr key-and-expansion))))
  (yas-exit-all-snippets))

(defun yas-should-not-expand (keys)
  (dolist (key keys)
    (yas-exit-all-snippets)
    (erase-buffer)
    (insert key)
    (let ((yas-fallback-behavior nil))
      (ert-simulate-command '(yas-expand)))
    (should (string= (yas--buffer-contents) key))))

(defun yas-mock-insert (string)
  (interactive)
  (do ((i 0 (1+ i)))
      ((= i (length string)))
    (insert (aref string i))))

(defun yas-make-file-or-dirs (ass)
  (let ((file-or-dir-name (car ass))
        (content (cdr ass)))
    (cond ((listp content)
           (make-directory file-or-dir-name 'parents)
           (let ((default-directory (concat default-directory "/" file-or-dir-name)))
             (mapc #'yas-make-file-or-dirs content)))
          ((stringp content)
           (with-temp-buffer
             (insert content)
             (write-region nil nil file-or-dir-name nil 'nomessage)))
          (t
           (message "[yas] oops don't know this content")))))


(defun yas-variables ()
  (let ((syms))
    (mapatoms #'(lambda (sym)
                  (if (and (string-match "^yas-[^/]" (symbol-name sym))
                           (boundp sym))
                      (push sym syms))))
    syms))

(defun yas-call-with-saving-variables (fn)
  (let* ((vars (yas-variables))
         (saved-values (mapcar #'symbol-value vars)))
    (unwind-protect
        (funcall fn)
      (loop for var in vars
            for saved in saved-values
            do (set var saved)))))

(defmacro yas-saving-variables (&rest body)
  `(yas-call-with-saving-variables #'(lambda () ,@body)))


(defun yas-call-with-snippet-dirs (dirs fn)
  (let* ((default-directory (make-temp-file "yasnippet-fixture" t))
         (yas-snippet-dirs (mapcar #'car dirs)))
    (with-temp-message ""
      (unwind-protect
          (progn
            (mapc #'yas-make-file-or-dirs dirs)
            (funcall fn))
        (when (>= emacs-major-version 24)
          (delete-directory default-directory 'recursive))))))

(defmacro yas-with-snippet-dirs (dirs &rest body)
  (declare (indent defun))
  `(yas-call-with-snippet-dirs ,dirs
                               #'(lambda ()
                                   ,@body)))

;;; Older emacsen
;;;
(unless (fboundp 'special-mode)
  (define-minor-mode special-mode "Just a placeholder for something isn't in emacs 22"))

;;; btw to test this in emacs22 mac osx:
;;; curl -L -O https://github.com/mirrors/emacs/raw/master/lisp/emacs-lisp/ert.el
;;; curl -L -O https://github.com/mirrors/emacs/raw/master/lisp/emacs-lisp/ert-x.el
;;; /usr/bin/emacs -nw -Q -L . -l yasnippet-tests.el --batch -e ert


(provide 'yasnippet-tests)
;;; yasnippet-tests.el ends here
;; Local Variables:
;; lexical-binding: t
;; End: