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+;;; imenu-tests.el --- Test suite for imenu.
+
+;; Copyright (C) 2013-2015 Free Software Foundation, Inc.
+
+;; Author: Masatake YAMATO <yamato@redhat.com>
+;; Keywords: tools convenience
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'imenu)
+
+;; (imenu-simple-scan-deftest-gather-strings-from-list
+;;     '(nil t 'a (0 . "x") ("c" . "d") ("a" 0 "b") ))
+;; => ("b" "a" "d" "c" "x")
+(defun imenu-simple-scan-deftest-gather-strings-from-list(input)
+  "Gather strings from INPUT, a list."
+  (let ((result ()))
+    (while input
+      (cond
+       ((stringp input)
+	(setq result (cons input result)
+	      input nil))
+       ((atom input)
+	(setq input nil))
+       ((listp (car input))
+	(setq result (append
+		      (imenu-simple-scan-deftest-gather-strings-from-list (car input))
+		      result)
+	      input (cdr input)))
+       ((stringp (car input))
+	(setq result (cons (car input) result)
+	      input (cdr input)))
+       (t
+	(setq input (cdr input)))))
+    result))
+
+(defmacro imenu-simple-scan-deftest (name doc major-mode content expected-items)
+  "Generate an ert test for mode-own imenu expression.
+Run `imenu-create-index-function' at the buffer which content is
+CONTENT with MAJOR-MODE. A generated test runs `imenu-create-index-function'
+at the buffer which content is CONTENT with MAJOR-MODE. Then it compares a list
+of strings which are picked up from the result with EXPECTED-ITEMS."
+  (let ((xname (intern (concat "imenu-simple-scan-deftest-" (symbol-name name)))))
+    `(ert-deftest ,xname ()
+	 ,doc
+       (with-temp-buffer
+	 (insert ,content)
+	 (funcall ',major-mode)
+	 (let ((result-items (sort (imenu-simple-scan-deftest-gather-strings-from-list
+				    (funcall imenu-create-index-function))
+				   #'string-lessp))
+	       (expected-items (sort (copy-sequence ,expected-items) #'string-lessp)))
+	   (should (equal result-items expected-items))
+	   )))))
+
+(imenu-simple-scan-deftest sh "Test imenu expression for sh-mode." sh-mode "a()
+{
+}
+function b
+{
+}
+function c()
+{
+}
+function ABC_D()
+{
+}
+" '("a" "b" "c" "ABC_D"))
+
+(provide 'imenu-tests)
+
+;;; imenu-tests.el ends here