Use lexical binding in benchmark.el

* lisp/emacs-lisp/benchmark.el: Enable lexical binding.
(benchmark-elapse): Use 'declare'.
* test/lisp/emacs-lisp/benchmark-tests.el: Add test suite.

2 files changed, 53 insertions, 4 deletions

diff --git a/lisp/emacs-lisp/benchmark.el b/lisp/emacs-lisp/benchmark.el
index 25eddf5f6b0..a2217d20953 100644
--- a/lisp/emacs-lisp/benchmark.el
+++ b/lisp/emacs-lisp/benchmark.el
@@ -1,4 +1,4 @@
-;;; benchmark.el --- support for benchmarking code
+;;; benchmark.el --- support for benchmarking code  -*- lexical-binding: t -*-
 
 ;; Copyright (C) 2003-2017 Free Software Foundation, Inc.
 
@@ -33,6 +33,7 @@
 
 (defmacro benchmark-elapse (&rest forms)
   "Return the time in seconds elapsed for execution of FORMS."
+  (declare (indent 0) (debug t))
   (let ((t1 (make-symbol "t1"))
         (t2 (make-symbol "t2")))
     `(let (,t1 ,t2)
@@ -41,9 +42,6 @@
        (setq ,t2 (current-time))
        (float-time (time-subtract ,t2 ,t1)))))
 
-(put 'benchmark-elapse 'edebug-form-spec t)
-(put 'benchmark-elapse 'lisp-indent-function 0)
-
 ;;;###autoload
 (defmacro benchmark-run (&optional repetitions &rest forms)
   "Time execution of FORMS.
diff --git a/test/lisp/emacs-lisp/benchmark-tests.el b/test/lisp/emacs-lisp/benchmark-tests.el
new file mode 100644
index 00000000000..14426aeec41
--- /dev/null
+++ b/test/lisp/emacs-lisp/benchmark-tests.el
@@ -0,0 +1,51 @@
+;;; benchmark-tests.el --- Test suite for benchmark.  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2017 Free Software Foundation, Inc.
+
+;; 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 'benchmark)
+(require 'ert)
+
+(ert-deftest benchmark-tests ()
+  (let (str t-long t-short)
+    (should (consp (benchmark-run nil (1+ 0))))
+    (should (consp (benchmark-run 1 (1+ 0))))
+    (should (stringp (benchmark nil (1+ 0))))
+    (should (stringp (benchmark 1 (1+ 0))))
+    (should (consp (benchmark-run-compiled nil (1+ 0))))
+    (should (consp (benchmark-run-compiled 1 (1+ 0))))
+    ;; First test is heavier, must need longer time.
+    (should (> (car (benchmark-run nil
+                      (let ((n 100000)) (while (> n 1) (setq n (1- n))))))
+               (car (benchmark-run nil (1+ 0)))))
+    (should (> (car (benchmark-run nil
+                      (let ((n 100000)) (while (> n 1) (setq n (1- n))))))
+               (car (benchmark-run nil (1+ 0)))))
+    (should (> (car (benchmark-run-compiled nil
+                      (let ((n 100000)) (while (> n 1) (setq n (1- n))))))
+               (car (benchmark-run-compiled nil (1+ 0)))))
+    (setq str (benchmark nil '(let ((n 100000)) (while (> n 1) (setq n (1- n))))))
+    (string-match "Elapsed time: \\([0-9.]+\\)" str)
+    (setq t-long (string-to-number (match-string 1 str)))
+    (setq str (benchmark nil '(1+ 0)))
+    (string-match "Elapsed time: \\([0-9.]+\\)" str)
+    (setq t-short (string-to-number (match-string 1 str)))
+    (should (> t-long t-short))))
+
+;;; benchmark-tests.el ends here.