X-Git-Url: https://code.delx.au/gnu-emacs-elpa/blobdiff_plain/afa1b19a2b7a7f380aaebdd2d706e089b2585ebb..146b161112b68c99ecd607ec5360accc1f4db3cd:/yasnippet-tests.el

diff --git a/yasnippet-tests.el b/yasnippet-tests.el
old mode 100755
new mode 100644
index 157debb82..8ba4632d3
--- a/yasnippet-tests.el
+++ b/yasnippet-tests.el
@@ -1,252 +1,1018 @@
-;;; 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
-
-(ert-deftest field-navigation ()
-  (with-temp-buffer
-    (yas/minor-mode 1)
-    (yas/expand-snippet "${1:brother} from another ${2:mother}")
-    (should (string= (buffer-substring-no-properties (point-min) (point-max))
-                     "brother from another mother"))
-    
-    (should (looking-at "brother"))
-    (ert-simulate-command '(yas/next-field-or-maybe-expand))
-    (should (looking-at "mother"))
-    (ert-simulate-command '(yas/prev-field))
-    (should (looking-at "brother"))))
-
-(ert-deftest simple-mirror ()
-  (with-temp-buffer
-    (yas/minor-mode 1)
-    (yas/expand-snippet "${1:brother} from another $1")
-    (should (string= (buffer-substring-no-properties (point-min) (point-max))
-                     "brother from another brother"))
-    (ert-simulate-command `(yas/mock-insert "bla"))
-    (should (string= (buffer-substring-no-properties (point-min) (point-max))
-                     "bla from another bla"))))
-
-(ert-deftest mirror-with-transformation ()
-  (with-temp-buffer
-    (yas/minor-mode 1)
-    (yas/expand-snippet "${1:brother} from another ${1:$(upcase yas/text)}")
-    (should (string= (buffer-substring-no-properties (point-min) (point-max))
-                     "brother from another BROTHER"))
-    (ert-simulate-command `(yas/mock-insert "bla"))
-    (should (string= (buffer-substring-no-properties (point-min) (point-max))
-                     "bla from another BLA"))))
-
-(ert-deftest nested-placeholders-kill-superfield ()
-  (with-temp-buffer
-    (yas/minor-mode 1)
-    (yas/expand-snippet "brother from ${2:another ${3:mother}}!")
-    (should (string= (buffer-substring-no-properties (point-min) (point-max))
-                     "brother from another mother!"))
-    (ert-simulate-command `(yas/mock-insert "bla"))
-    (should (string= (buffer-substring-no-properties (point-min) (point-max))
-                     "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= (buffer-substring-no-properties (point-min) (point-max))
-                     "brother from another bla!"))))
-
-;; (ert-deftest in-snippet-undo ()
-;;   (with-temp-buffer
-;;     (yas/minor-mode 1)
-;;     (yas/expand-snippet "brother from ${2:another ${3:mother}}!")
-;;     (ert-simulate-command '(yas/next-field-or-maybe-expand))
-;;     (ert-simulate-command `(yas/mock-insert "bla"))
-;;     (ert-simulate-command '(undo))
-;;     (should (string= (buffer-substring-no-properties (point-min) (point-max))
-;;                      "brother from another mother!"))))
-
-
-;;; Misc tests
-;;; 
-
-(ert-deftest protection-overlay-no-cheating ()
-  "Protection overlays at the very end of the buffer, are dealt by cheatingly inserting a newline!
-
-TODO: correct this bug!"
-  :expected-result :failed
-  (with-temp-buffer
-    (yas/minor-mode 1)
-    (yas/expand-snippet "${2:brother} from another ${1:mother}")
-    (should (string= (buffer-substring-no-properties (point-min) (point-max))
-                     "brother from another mother") ;; no newline should be here!
-            )))
-
-;;; Loading
-;;;
-(defmacro with-some-interesting-snippet-dirs (&rest body)
-  `(yas/saving-variables
-    (with-snippet-dirs
-     '((".emacs.d/snippets"
-        ("c-mode"
-         (".yas-parents" . "cc-mode")
-         ("printf" . "printf($1);"))
-        ("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"))
-        ("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/basic-jit-loading-1))
-
-(ert-deftest basic-jit-loading-with-compiled-snippets ()
-  "Test basic loading and expansion of snippets"
-  (yas/basic-jit-loading-1 'compile))
-
-(defun yas/basic-jit-loading-1 (&optional compile)
-  (yas/saving-variables
-   (with-snippet-dirs
-    '((".emacs.d/snippets"
-       ("c-mode"
-        (".yas-parents" . "cc-mode")
-        ("printf" . "printf($1);"))
-       ("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"))
-       ("cc-mode" ("def" . "# define"))
-       ("emacs-lisp-mode" ("dolist" . "(dolist)"))
-       ("lisp-interaction-mode" ("sc" . "brother from another mother"))))
-    (yas/reload-all)
-    (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) ;; either one will load two tables depending on yas/global-mode (FIXME)
-      (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)
-      (yas/should-expand '(("printf" . "printf();")
-                           ("def" . "# define")))
-      (yas/should-not-expand '("sc" "dolist" "ert-deftest"))))))
-
-;;; Helpers
-;;;
-
-(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= (buffer-substring-no-properties (point-min) (point-max))
-                       (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= (buffer-substring-no-properties (point-min) (point-max)) 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-current-buffer (find-file file-or-dir-name)
-             (insert content)
-             (save-buffer)
-             (kill-buffer (current-buffer))))
-          (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))
-
-
-(defmacro yas/saving-variables (&rest body)
-  `(let ,(mapcar #'(lambda (sym)
-                     `(,sym ,sym))
-                 (yas/variables))
-     ,@body))
-
-(defmacro with-snippet-dirs (dirs &rest body)
-  `(let ((default-directory (make-temp-file "yasnippet-fixture" t)))
-     (unwind-protect
-         (progn       
-           (setq yas/snippet-dirs ',(mapcar #'car (cadr dirs)))
-           (mapc #'yas/make-file-or-dirs ,dirs)
-           ,@body)
-       (when (>= emacs-major-version 23)
-         (delete-directory default-directory 'recursive)))))
-
-;;; 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
+;;; yasnippet-tests.el --- some yasnippet tests  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2012, 2013, 2014, 2015  Free Software Foundation, Inc.
+
+;; 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)
+(require 'cl)
+
+
+;;; 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 $1")
+    (should (string= (yas--buffer-contents)
+                     "brother from another brother"))
+    (yas-mock-insert "bla")
+    (should (string= (yas--buffer-contents)
+                     "bla from another bla"))))
+
+(ert-deftest mirror-with-transformation ()
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (yas-expand-snippet "${1:brother} from another ${1:$(upcase yas-text)}")
+    (should (string= (yas--buffer-contents)
+                     "brother from another BROTHER"))
+    (yas-mock-insert "bla")
+    (should (string= (yas--buffer-contents)
+                     "bla from another BLA"))))
+
+(ert-deftest mirror-with-transformation-and-autofill ()
+  "Test interaction of autofill with mirror transforms"
+  (let ((words "one two three four five")
+        filled-words)
+    (with-temp-buffer
+      (c-mode)      ; In `c-mode' filling comments works by narrowing.
+      (yas-minor-mode +1)
+      (setq fill-column 10)
+      (auto-fill-mode +1)
+      (yas-expand-snippet "/* $0\n */")
+      (yas-mock-insert words)
+      (setq filled-words (delete-and-extract-region (point-min) (point-max)))
+      (yas-expand-snippet "/* $1\n */\n$2$2")
+      (should (string= (yas--buffer-contents)
+                       "/* \n */\n"))
+      (yas-mock-insert words)
+      (should (string= (yas--buffer-contents)
+                       (concat filled-words "\n"))))))
+
+
+(ert-deftest primary-field-transformation ()
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (let ((snippet "${1:$$(upcase yas-text)}${1:$(concat \"bar\" yas-text)}"))
+      (yas-expand-snippet snippet)
+      (should (string= (yas--buffer-contents) "bar"))
+      (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!"))
+    (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 ${3:mother}}!")
+    (ert-simulate-command '(yas-next-field-or-maybe-expand))
+    (yas-mock-insert "bla")
+    (should (string= (yas--buffer-contents)
+                     "brother from another bla!"))))
+
+(ert-deftest mirrors-adjacent-to-fields-with-nested-mirrors ()
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (yas-expand-snippet "<%= f.submit \"${1:Submit}\"${2:$(and (yas-text) \", :disable_with => '\")}${2:$1ing...}${2:$(and (yas-text) \"'\")} %>")
+    (should (string= (yas--buffer-contents)
+                     "<%= f.submit \"Submit\", :disable_with => 'Submiting...' %>"))
+    (yas-mock-insert "Send")
+    (should (string= (yas--buffer-contents)
+                     "<%= f.submit \"Send\", :disable_with => 'Sending...' %>"))))
+
+(ert-deftest deep-nested-mirroring-issue-351 ()
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (yas-expand-snippet "${1:FOOOOOOO}${2:$1}${3:$2}${4:$3}")
+    (yas-mock-insert "abc")
+    (should (string= (yas--buffer-contents) "abcabcabcabc"))))
+
+(ert-deftest delete-numberless-inner-snippet-issue-562 ()
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (yas-expand-snippet "${3:${test}bla}$0${2:ble}")
+    (ert-simulate-command '(yas-next-field-or-maybe-expand))
+    (should (looking-at "testblable"))
+    (ert-simulate-command '(yas-next-field-or-maybe-expand))
+    (ert-simulate-command '(yas-skip-and-clear-or-delete-char))
+    (should (looking-at "ble"))
+    (should (null (yas--snippets-at-point)))))
+
+(ert-deftest ignore-trailing-whitespace ()
+  (should (equal
+           (with-temp-buffer
+             (insert "# key: foo\n# --\nfoo")
+             (yas--parse-template))
+           (with-temp-buffer
+             (insert "# key: foo \n# --\nfoo")
+             (yas--parse-template)))))
+
+;; (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))
+;;     (yas-mock-insert "bla")
+;;     (ert-simulate-command '(undo))
+;;     (should (string= (yas--buffer-contents)
+;;                      "brother from another mother!"))))
+
+(ert-deftest dont-clear-on-partial-deletion-issue-515 ()
+  "Ensure fields are not cleared when user doesn't really mean to."
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (yas-expand-snippet "my ${1:kid brother} from another ${2:mother}")
+
+    (ert-simulate-command '(kill-word 1))
+    (ert-simulate-command '(delete-char 1))
+
+    (should (string= (yas--buffer-contents)
+                     "my brother from another mother"))
+    (should (looking-at "brother"))
+
+    (ert-simulate-command '(yas-next-field))
+    (should (looking-at "mother"))
+    (ert-simulate-command '(yas-prev-field))
+    (should (looking-at "brother"))))
+
+(ert-deftest do-clear-on-yank-issue-515 ()
+  "A yank should clear an unmodified field."
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (yas-expand-snippet "my ${1:kid brother} from another ${2:mother}")
+    (yas-mock-yank "little sibling")
+    (should (string= (yas--buffer-contents)
+                     "my little sibling from another mother"))
+    (ert-simulate-command '(yas-next-field))
+    (ert-simulate-command '(yas-prev-field))
+    (should (looking-at "little sibling"))))
+
+(ert-deftest basic-indentation ()
+  (with-temp-buffer
+    (ruby-mode)
+    (yas-minor-mode 1)
+    (set (make-local-variable 'yas-indent-line) 'auto)
+    (set (make-local-variable 'yas-also-auto-indent-first-line) t)
+    (yas-expand-snippet "def ${1:method}${2:(${3:args})}\n$0\nend")
+    ;; Note that empty line is not indented.
+    (should (string= "def method(args)
+
+end" (buffer-string)))
+    (cl-loop repeat 3 do (ert-simulate-command '(yas-next-field)))
+    (yas-mock-insert (make-string (random 5) ?\ )) ; purposedly mess up indentation
+    (yas-expand-snippet "class << ${self}\n  $0\nend")
+    (ert-simulate-command '(yas-next-field))
+    (should (string= "def method(args)
+  class << self
+    
+  end
+end" (buffer-string)))
+    (should (= 4 (current-column)))))
+
+(ert-deftest navigate-a-snippet-with-multiline-mirrors-issue-665 ()
+  "In issue 665, a multi-line mirror is attempted.
+
+Indentation doesn't (yet) happen on these mirrors, but let this
+test guard against any misnavigations that might be introduced by
+an incorrect implementation of mirror auto-indentation"
+  (with-temp-buffer
+    (ruby-mode)
+    (yas-minor-mode 1)
+    (yas-expand-snippet "def initialize(${1:params})\n$2${1:$(
+mapconcat #'(lambda (arg)
+                 (format \"@%s = %s\" arg arg))
+             (split-string yas-text \", \")
+             \"\n\")}\nend")
+    (yas-mock-insert "bla, ble, bli")
+    (ert-simulate-command '(yas-next-field))
+    (let ((expected (mapconcat #'identity
+                               '("@bla = bla"
+                                 "[[:blank:]]*@ble = ble"
+                                 "[[:blank:]]*@bli = bli")
+                               "\n")))
+      (should (looking-at expected))
+      (yas-mock-insert "blo")
+      (ert-simulate-command '(yas-prev-field))
+      (ert-simulate-command '(yas-next-field))
+      (should (looking-at (concat "blo" expected))))))
+
+
+;;; Snippet expansion and character escaping
+;;; Thanks to @zw963 (Billy) for the testing
+;;;
+(ert-deftest escape-dollar ()
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (yas-expand-snippet "bla\\${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
+    (yas-minor-mode 1)
+    (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)
+      (yas-mock-insert "bbb")
+      (should (string= (yas--buffer-contents) "if condition\naaa\nelse\nbbb\nend")))))
+
+(defmacro yas--with-font-locked-temp-buffer (&rest body)
+  "Like `with-temp-buffer', but ensure `font-lock-mode'."
+  (declare (indent 0) (debug t))
+  (let ((temp-buffer (make-symbol "temp-buffer")))
+    ;; NOTE: buffer name must not start with a space, otherwise
+    ;; `font-lock-mode' doesn't turn on.
+    `(let ((,temp-buffer (generate-new-buffer "*yas-temp*")))
+       (with-current-buffer ,temp-buffer
+         ;; pretend we're interactive so `font-lock-mode' turns on
+         (let ((noninteractive nil)
+               ;; turn on font locking after major mode change
+               (change-major-mode-after-body-hook #'font-lock-mode))
+           (unwind-protect
+               (progn (require 'font-lock)
+                      ;; turn on font locking before major mode change
+                      (font-lock-mode +1)
+                      ,@body)
+             (and (buffer-name ,temp-buffer)
+                  (kill-buffer ,temp-buffer))))))))
+
+(defmacro yas-saving-variables (&rest body)
+  `(yas-call-with-saving-variables #'(lambda () ,@body)))
+
+(defmacro yas-with-snippet-dirs (dirs &rest body)
+  (declare (indent defun))
+  `(yas-call-with-snippet-dirs ,dirs
+                               #'(lambda ()
+                                   ,@body)))
+
+(ert-deftest example-for-issue-474 ()
+  (yas--with-font-locked-temp-buffer
+    (c-mode)
+    (yas-minor-mode 1)
+    (insert "#include <foo>\n")
+    (let ((yas-good-grace nil)) (yas-expand-snippet "`\"TODO: \"`"))
+    (should (string= (yas--buffer-contents) "#include <foo>\nTODO: "))))
+
+(ert-deftest example-for-issue-404 ()
+  (yas--with-font-locked-temp-buffer
+    (c++-mode)
+    (yas-minor-mode 1)
+    (insert "#include <foo>\n")
+    (let ((yas-good-grace nil)) (yas-expand-snippet "main"))
+    (should (string= (yas--buffer-contents) "#include <foo>\nmain"))))
+
+(ert-deftest example-for-issue-404-c-mode ()
+  (yas--with-font-locked-temp-buffer
+    (c-mode)
+    (yas-minor-mode 1)
+    (insert "#include <foo>\n")
+    (let ((yas-good-grace nil)) (yas-expand-snippet "main"))
+    (should (string= (yas--buffer-contents) "#include <foo>\nmain"))))
+
+(ert-deftest middle-of-buffer-snippet-insertion ()
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (insert "beginning")
+    (save-excursion (insert "end"))
+    (yas-expand-snippet "-middle-")
+    (should (string= (yas--buffer-contents) "beginning-middle-end"))))
+
+(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:$(if (string-match \"foo\\\\\\\\(ba+r\\\\\\\\)baz\" yas-text)
+                                \"ok\"
+                                \"fail\")}"))
+      (yas-expand-snippet snippet)
+      (should (string= (yas--buffer-contents) "fail"))
+      (yas-mock-insert "foobaaar")
+      (should (string= (yas--buffer-contents) "foobaaarfail"))
+      (yas-mock-insert "baz")
+      (should (string= (yas--buffer-contents) "foobaaarbazok")))))
+
+
+;;; Misc tests
+;;;
+(ert-deftest protection-overlay-no-cheating ()
+  "Protection overlays at the very end of the buffer are dealt
+  with by cheatingly inserting a newline!
+
+TODO: correct this bug!"
+  :expected-result :failed
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (yas-expand-snippet "${2:brother} from another ${1:mother}")
+    (should (string= (yas--buffer-contents)
+                     "brother from another mother") ;; no newline should be here!
+            )))
+
+(defvar yas--barbaz)
+(defvar yas--foobarbaz)
+
+;; See issue #497. To understand this test, follow the example of the
+;; `yas-key-syntaxes' docstring.
+;;
+(ert-deftest complicated-yas-key-syntaxes ()
+  (with-temp-buffer
+    (yas-saving-variables
+     (yas-with-snippet-dirs
+       '((".emacs.d/snippets"
+          ("emacs-lisp-mode"
+           ("foo-barbaz" . "# condition: yas--foobarbaz\n# --\nOKfoo-barbazOK")
+           ("barbaz" . "# condition: yas--barbaz\n# --\nOKbarbazOK")
+           ("baz" . "OKbazOK")
+           ("'quote" . "OKquoteOK"))))
+       (yas-reload-all)
+       (emacs-lisp-mode)
+       (yas-minor-mode-on)
+       (let ((yas-key-syntaxes '("w" "w_")))
+         (let ((yas--barbaz t))
+           (yas-should-expand '(("foo-barbaz" . "foo-OKbarbazOK")
+                                ("barbaz" . "OKbarbazOK"))))
+         (let ((yas--foobarbaz t))
+           (yas-should-expand '(("foo-barbaz" . "OKfoo-barbazOK"))))
+         (let ((yas-key-syntaxes
+                (cons #'(lambda (_start-point)
+                          (unless (looking-back "-")
+                            (backward-char)
+                            'again))
+                      yas-key-syntaxes))
+               (yas--foobarbaz t))
+           (yas-should-expand '(("foo-barbaz" . "foo-barOKbazOK")))))
+       (let ((yas-key-syntaxes '(yas-try-key-from-whitespace)))
+         (yas-should-expand '(("xxx\n'quote" . "xxx\nOKquoteOK")
+                              ("xxx 'quote" . "xxx OKquoteOK"))))
+       (let ((yas-key-syntaxes '(yas-shortest-key-until-whitespace))
+             (yas--foobarbaz t) (yas--barbaz t))
+         (yas-should-expand '(("foo-barbaz" . "foo-barOKbazOK")))
+         (setq yas-key-syntaxes '(yas-longest-key-from-whitespace))
+         (yas-should-expand '(("foo-barbaz" . "OKfoo-barbazOK")
+                              ("foo " . "foo "))))))))
+
+
+;;; Loading
+;;;
+(defun yas--call-with-temporary-redefinitions (function
+                                               &rest function-names-and-overriding-functions)
+  (let* ((overrides (remove-if-not #'(lambda (fdef)
+                                       (fboundp (first fdef)))
+                                   function-names-and-overriding-functions))
+         (definition-names (mapcar #'first overrides))
+         (overriding-functions (mapcar #'second overrides))
+         (saved-functions (mapcar #'symbol-function definition-names)))
+    ;; saving all definitions before overriding anything ensures FDEFINITION
+    ;; errors don't cause accidental permanent redefinitions.
+    ;;
+    (cl-labels ((set-fdefinitions (names functions)
+                                  (loop for name in names
+                                        for fn in functions
+                                        do (fset name fn))))
+      (set-fdefinitions definition-names overriding-functions)
+      (unwind-protect (funcall function)
+	(set-fdefinitions definition-names saved-functions)))))
+
+(defmacro yas--with-temporary-redefinitions (fdefinitions &rest body)
+  ;; "Temporarily (but globally) redefine each function in FDEFINITIONS.
+  ;; E.g.: (yas--with-temporary-redefinitions ((foo (x) ...)
+  ;;                                           (bar (x) ...))
+  ;;         ;; code that eventually calls foo, bar of (setf foo)
+  ;;         ...)"
+  ;; FIXME: This is hideous!  Better use defadvice (or at least letf).
+  `(yas--call-with-temporary-redefinitions
+    (lambda () ,@body)
+    ,@(mapcar #'(lambda (thingy)
+                  `(list ',(first thingy)
+                         (lambda ,@(rest thingy))))
+              fdefinitions)))
+
+(defmacro yas-with-overriden-buffer-list (&rest body)
+  (let ((saved-sym (make-symbol "yas--buffer-list")))
+    `(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 snippet-lookup ()
+  "Test `yas-lookup-snippet'."
+  (yas-with-some-interesting-snippet-dirs
+   (yas-reload-all 'no-jit)
+   (should (equal (yas-lookup-snippet "printf" 'c-mode) "printf($1);"))
+   (should (equal (yas-lookup-snippet "def" 'c-mode) "# define"))
+   (should-not (yas-lookup-snippet "no such snippet" nil 'noerror))
+   (should-not (yas-lookup-snippet "printf" 'emacs-lisp-mode 'noerror))))
+
+(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 compiled snippets"
+  (yas-with-some-interesting-snippet-dirs
+   (yas-reload-all)
+   (yas-recompile-all)
+   (yas--with-temporary-redefinitions ((yas--load-directory-2
+                                        (&rest _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 visiting-compiled-snippets ()
+  "Test snippet visiting for compiled snippets."
+  (yas-with-some-interesting-snippet-dirs
+   (yas-recompile-all)
+   (yas-reload-all 'no-jit) ; must be loaded for `yas-lookup-snippet' to work.
+   (yas--with-temporary-redefinitions ((find-file-noselect
+                                        (filename &rest _)
+                                        (throw 'yas-snippet-file filename)))
+     (should (string-suffix-p
+              "cc-mode/def"
+              (catch 'yas-snippet-file
+                (yas--visit-snippet-file-1
+                 (yas--lookup-snippet-1 "def" 'cc-mode))))))))
+
+(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 and-that-one"))
+                             ("yet-another-c-mode"
+                              (".yas-parents" . "c-mode and-also-this-one lisp-interaction-mode"))))
+     (yas-reload-all)
+     (with-temp-buffer
+       (let* ((major-mode 'c-mode)
+              (expected `(c-mode
+                          cc-mode
+                          yet-another-c-mode
+                          and-also-this-one
+                          and-that-one
+                          ;; prog-mode doesn't exist in emacs 24.3
+                          ,@(if (fboundp 'prog-mode)
+                                '(prog-mode))
+                          emacs-lisp-mode
+                          lisp-interaction-mode))
+              (observed (yas--modes-to-activate)))
+         (should (equal major-mode (car observed)))
+         (should (equal (sort expected #'string<) (sort observed #'string<))))))))
+
+(ert-deftest extra-modes-parenthood ()
+  "Test activation of parents of `yas--extra-modes'."
+  (yas-saving-variables
+   (yas-with-snippet-dirs '((".emacs.d/snippets"
+                             ("c-mode"
+                              (".yas-parents" . "cc-mode"))
+                             ("yet-another-c-mode"
+                              (".yas-parents" . "c-mode and-also-this-one lisp-interaction-mode"))))
+     (yas-reload-all)
+     (with-temp-buffer
+       (yas-activate-extra-mode 'c-mode)
+       (yas-activate-extra-mode 'yet-another-c-mode)
+       (yas-activate-extra-mode 'and-that-one)
+       (let* ((expected-first `(and-that-one
+                                yet-another-c-mode
+                                c-mode
+                                ,major-mode))
+              (expected-rest `(cc-mode
+                               ;; prog-mode doesn't exist in emacs 24.3
+                               ,@(if (fboundp 'prog-mode)
+                                     '(prog-mode))
+                               emacs-lisp-mode
+                               and-also-this-one
+                               lisp-interaction-mode))
+              (observed (yas--modes-to-activate)))
+         (should (equal expected-first
+                        (cl-subseq observed 0 (length expected-first))))
+         (should (equal (sort expected-rest #'string<)
+                        (sort (cl-subseq observed (length expected-first)) #'string<))))))))
+
+(defalias 'yas--phony-c-mode 'c-mode)
+
+(ert-deftest issue-492-and-494 ()
+  (define-derived-mode yas--test-mode yas--phony-c-mode "Just a test mode")
+  (yas-with-snippet-dirs '((".emacs.d/snippets"
+                            ("yas--test-mode")))
+                         (yas-reload-all)
+                         (with-temp-buffer
+                           (let* ((major-mode 'yas--test-mode)
+                                  (expected `(c-mode
+                                              ,@(if (fboundp 'prog-mode)
+                                                    '(prog-mode))
+                                              yas--phony-c-mode
+                                              yas--test-mode))
+                                  (observed (yas--modes-to-activate)))
+                             (should (null (cl-set-exclusive-or expected observed)))
+                             (should (= (length expected)
+                                        (length observed)))))))
+
+(define-derived-mode yas--test-mode c-mode "Just a test mode")
+(define-derived-mode yas--another-test-mode c-mode "Another test mode")
+
+(ert-deftest issue-504-tricky-jit ()
+  (yas-with-snippet-dirs
+   '((".emacs.d/snippets"
+      ("yas--another-test-mode"
+       (".yas-parents" . "yas--test-mode"))
+      ("yas--test-mode")))
+   (let ((b (with-current-buffer (generate-new-buffer "*yas-test*")
+              (yas--another-test-mode)
+              (current-buffer))))
+     (unwind-protect
+         (progn
+           (yas-reload-all)
+           (should (= 0 (hash-table-count yas--scheduled-jit-loads))))
+       (kill-buffer b)))))
+
+(defun yas--basic-jit-loading-1 ()
+  (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))))
+    ;; FIXME: actually should restore to whatever saved values where there.
+    ;;
+    (define-key yas-minor-mode-map [tab] 'yas-expand)
+    (define-key yas-minor-mode-map (kbd "TAB") 'yas-expand)
+    (define-key yas-minor-mode-map (kbd "SPC") nil)))
+
+(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))))
+
+(ert-deftest test-yas-activate-extra-modes ()
+  "Given a symbol, `yas-activate-extra-mode' should be able to
+add the snippets associated with the given mode."
+  (with-temp-buffer
+    (yas-saving-variables
+     (yas-with-snippet-dirs
+       '((".emacs.d/snippets"
+          ("markdown-mode"
+           ("_" . "_Text_ "))
+          ("emacs-lisp-mode"
+           ("car" . "(car )"))))
+       (yas-reload-all)
+       (emacs-lisp-mode)
+       (yas-minor-mode-on)
+       (yas-activate-extra-mode 'markdown-mode)
+       (should (eq 'markdown-mode (car yas--extra-modes)))
+       (yas-should-expand '(("_" . "_Text_ ")))
+       (yas-should-expand '(("car" . "(car )")))
+       (yas-deactivate-extra-mode 'markdown-mode)
+       (should-not (eq 'markdown-mode (car yas--extra-modes)))
+       (yas-should-not-expand '("_"))
+       (yas-should-expand '(("car" . "(car )")))))))
+
+
+;;; Helpers
+;;;
+(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)))
+    (unless (string= (yas--buffer-contents) (cdr key-and-expansion))
+      (ert-fail (format "\"%s\" should have expanded to \"%s\" but got \"%s\""
+                        (car key-and-expansion)
+                        (cdr key-and-expansion)
+                        (yas--buffer-contents)))))
+  (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)))
+    (unless (string= (yas--buffer-contents) key)
+      (ert-fail (format "\"%s\" should have stayed put, but instead expanded to \"%s\""
+                        key
+                        (yas--buffer-contents))))))
+
+(defun yas-mock-insert (string)
+  (dotimes (i (length string))
+    (let ((last-command-event (aref string i)))
+      (ert-simulate-command '(self-insert-command 1)))))
+
+(defun yas-mock-yank (string)
+  (let ((interprogram-paste-function (lambda () string)))
+    (ert-simulate-command '(yank nil))))
+
+(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)))))
+
+(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))))))
+
+;;; Older emacsen
+;;;
+(unless (fboundp 'special-mode)
+  ;; FIXME: Why provide this default definition here?!?
+  (defalias 'special-mode 'fundamental))
+
+(unless (fboundp 'string-suffix-p)
+  ;; introduced in Emacs 24.4
+  (defun string-suffix-p (suffix string &optional ignore-case)
+    "Return non-nil if SUFFIX is a suffix of STRING.
+If IGNORE-CASE is non-nil, the comparison is done without paying
+attention to case differences."
+    (let ((start-pos (- (length string) (length suffix))))
+      (and (>= start-pos 0)
+           (eq t (compare-strings suffix nil nil
+                                  string start-pos nil ignore-case))))))
+
+;;; 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
+
+
+(put 'yas-saving-variables                   'edebug-form-spec t)
+(put 'yas-with-snippet-dirs                  'edebug-form-spec t)
+(put 'yas-with-overriden-buffer-list         'edebug-form-spec t)
+(put 'yas-with-some-interesting-snippet-dirs 'edebug-form-spec t)
+
+
+(put 'yas--with-temporary-redefinitions 'lisp-indent-function 1)
+(put 'yas--with-temporary-redefinitions 'edebug-form-spec '((&rest (defun*)) cl-declarations body))
+
+
+
+
+(provide 'yasnippet-tests)
+;; Local Variables:
+;; indent-tabs-mode: nil
+;; byte-compile-warnings: (not cl-functions)
+;; End:
+;;; yasnippet-tests.el ends here