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diff --git a/tests/exiftool-tests.el b/tests/exiftool-tests.el
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+;;; exiftool.el --- Elisp wrapper around exiftool ;; -*- lexical-binding: t -*-
+
+;; Elisp wrapper around exiftool
+;; Copyright (C) 2017 by Arun I
+;;
+;; Author: Arun I <arunisaac@systemreboot.net>
+;; Keywords: data
+;; Homepage: https://git.systemreboot.net/exiftool.el
+
+;; This file is part of exiftool.el.
+
+;; exiftool.el 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.
+
+;; exiftool.el 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 exiftool.el.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Unit testing for exiftool.el
+
+;;; Code:
+
+(defvar exiftool-tests--tag-value
+  '(("Marked" . "True")
+    ("Creator" . "foo")
+    ("Rights" . "bar")))
+
+(require 'exiftool)
+(require 'ert)
+
+(defmacro with-temp-test-file (test-file temp-file &rest body)
+  "Copy TEST-FILE to temporary file, put path in TEMP-FILE, evaluate BODY."
+  (declare (indent defun))
+  `(let ((,temp-file (make-temp-file "exiftool-"
+					 nil (concat "-" ,test-file))))
+     (copy-file ,test-file ,temp-file t)
+     ,@body
+     (delete-file ,temp-file)))
+
+(ert-deftest read-write-test ()
+  (with-temp-test-file "test1.png" temp-file
+    (apply 'exiftool-write temp-file exiftool-tests--tag-value)
+    (should (equal (apply 'exiftool-read temp-file (mapcar 'car exiftool-tests--tag-value))
+		   exiftool-tests--tag-value))))
+
+(ert-deftest delete-test ()
+  (with-temp-test-file "test1.png" temp-file
+    (exiftool-write temp-file (car exiftool-tests--tag-value))
+    (let ((delete-pair
+	   (cons (caar exiftool-tests--tag-value) "")))
+      (exiftool-write temp-file delete-pair)
+      (should (equal (car (exiftool-read temp-file "Marked"))
+		     delete-pair)))))
+
+(ert-deftest copy-test ()
+  (with-temp-test-file "test1.png" temp-1
+    (with-temp-test-file "test2.jpg" temp-2
+      (apply 'exiftool-write temp-1 exiftool-tests--tag-value)
+      (exiftool-copy temp-1 temp-2)
+      (let ((tags (mapcar 'car exiftool-tests--tag-value)))
+	(should (equal (apply 'exiftool-read temp-1 tags)
+		       (apply 'exiftool-read temp-2 tags)))))))
+
+(provide 'exiftool-tests)
+
+;;; exiftool-tests.el ends here