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+;;; subr-tests.el --- Tests for subr.el
+
+;; Copyright (C) 2015 Free Software Foundation, Inc.
+
+;; Author: Oleh Krehel <ohwoeowho@gmail.com>,
+;;         Nicolas Petton <nicolas@petton.fr>
+;; Keywords:
+
+;; 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/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(require 'ert)
+
+(ert-deftest let-when-compile ()
+  ;; good case
+  (should (equal (macroexpand '(let-when-compile ((foo (+ 2 3)))
+                                (setq bar (eval-when-compile (+ foo foo)))
+                                (setq boo (eval-when-compile (* foo foo)))))
+                 '(progn
+                   (setq bar (quote 10))
+                   (setq boo (quote 25)))))
+  ;; bad case: `eval-when-compile' omitted, byte compiler should catch this
+  (should (equal (macroexpand
+                  '(let-when-compile ((foo (+ 2 3)))
+                    (setq bar (+ foo foo))
+                    (setq boo (eval-when-compile (* foo foo)))))
+                 '(progn
+                   (setq bar (+ foo foo))
+                   (setq boo (quote 25)))))
+  ;; something practical
+  (should (equal (macroexpand
+                  '(let-when-compile ((keywords '("true" "false")))
+                    (font-lock-add-keywords
+                     'c++-mode
+                     `((,(eval-when-compile
+                           (format "\\<%s\\>" (regexp-opt keywords)))
+                         0 font-lock-keyword-face)))))
+                 '(font-lock-add-keywords
+                   (quote c++-mode)
+                   (list
+                    (cons (quote
+                           "\\<\\(?:\\(?:fals\\|tru\\)e\\)\\>")
+                     (quote
+                      (0 font-lock-keyword-face))))))))
+
+(ert-deftest string-comparison-test ()
+  (should (string-lessp "abc" "acb"))
+  (should (string-lessp "aBc" "abc"))
+  (should (string-lessp "abc" "abcd"))
+  (should (string-lessp "abc" "abcd"))
+  (should-not (string-lessp "abc" "abc"))
+  (should-not (string-lessp "" ""))
+
+  (should (string-greaterp "acb" "abc"))
+  (should (string-greaterp "abc" "aBc"))
+  (should (string-greaterp "abcd" "abc"))
+  (should (string-greaterp "abcd" "abc"))
+  (should-not (string-greaterp "abc" "abc"))
+  (should-not (string-greaterp "" ""))
+
+  ;; Symbols are also accepted
+  (should (string-lessp 'abc 'acb))
+  (should (string-lessp "abc" 'acb))
+  (should (string-greaterp 'acb 'abc))
+  (should (string-greaterp "acb" 'abc)))
+
+(ert-deftest subr-test-when ()
+  (should (equal (when t 1) 1))
+  (should (equal (when t 2) 2))
+  (should (equal (when nil 1) nil))
+  (should (equal (when nil 2) nil))
+  (should (equal (when t 'x 1) 1))
+  (should (equal (when t 'x 2) 2))
+  (should (equal (when nil 'x 1) nil))
+  (should (equal (when nil 'x 2) nil))
+  (let ((x 1))
+    (should-not (when nil
+                  (setq x (1+ x))
+                  x))
+    (should (= x 1))
+    (should (= 2 (when t
+                   (setq x (1+ x))
+                   x)))
+    (should (= x 2)))
+  (should (equal (macroexpand-all '(when a b c d))
+                 '(if a (progn b c d)))))
+
+(provide 'subr-tests)
+;;; subr-tests.el ends here