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+;;; image-tests.el --- Test suite for image-related functions.
+
+;; Copyright (C) 2019 Free Software Foundation, Inc.
+
+;; Author: Pip Cet <pipcet@gmail.com>
+;; Keywords:       internal
+;; Human-Keywords: internal
+
+;; 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 <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'ert)
+
+(ert-deftest image-test-duplicate-keywords ()
+  "Test that duplicate keywords in an image spec lead to rejection."
+  (should-error (image-size `(image :type xbm :type xbm :width 1 :height 1
+                                    :data ,(bool-vector t))
+                            t)))
+
+(ert-deftest image-test-circular-plist ()
+  "Test that a circular image spec is rejected."
+  (should-error
+   (let ((l `(image :type xbm :width 1 :height 1 :data ,(bool-vector t))))
+     (setcdr (last l) '#1=(:invalid . #1#))
+     (image-size l t))))
+
+(ert-deftest image-test-:type-property-value ()
+  "Test that :type is allowed as a property value in an image spec."
+  (should (equal (image-size `(image :dummy :type :type xbm :width 1 :height 1
+                                        :data ,(bool-vector t))
+                                t)
+                 (cons 1 1))))
+
+(ert-deftest image-test-circular-specs ()
+  "Test that circular image spec property values do not cause infinite recursion."
+  (should
+   (let* ((circ1 (cons :dummy nil))
+          (circ2 (cons :dummy nil))
+          (spec1 `(image :type xbm :width 1 :height 1
+                         :data ,(bool-vector 1) :ignored ,circ1))
+          (spec2 `(image :type xbm :width 1 :height 1
+                        :data ,(bool-vector 1) :ignored ,circ2)))
+     (setcdr circ1 circ1)
+     (setcdr circ2 circ2)
+     (and (equal (image-size spec1 t) (cons 1 1))
+          (equal (image-size spec2 t) (cons 1 1))))))
+
+(provide 'image-tests)
+;;; image-tests.el ends here.
+;;; image-tests.el --- tests for image.el -*- lexical-binding: t -*-
+
+;; Copyright (C) 2019-2020 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 <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'image)
+(eval-when-compile
+  (require 'cl-lib))
+
+(defconst image-tests--emacs-images-directory
+  (expand-file-name "../etc/images" (getenv "EMACS_TEST_DIRECTORY"))
+  "Directory containing Emacs images.")
+
+(ert-deftest image--set-property ()
+  "Test `image--set-property' behavior."
+  (let ((image (list 'image)))
+    ;; Add properties.
+    (setf (image-property image :scale) 1)
+    (should (equal image '(image :scale 1)))
+    (setf (image-property image :width) 8)
+    (should (equal image '(image :scale 1 :width 8)))
+    (setf (image-property image :height) 16)
+    (should (equal image '(image :scale 1 :width 8 :height 16)))
+    ;; Delete properties.
+    (setf (image-property image :type) nil)
+    (should (equal image '(image :scale 1 :width 8 :height 16)))
+    (setf (image-property image :scale) nil)
+    (should (equal image '(image :width 8 :height 16)))
+    (setf (image-property image :height) nil)
+    (should (equal image '(image :width 8)))
+    (setf (image-property image :width) nil)
+    (should (equal image '(image)))))
+
+(ert-deftest image-type-from-file-header-test ()
+  "Test image-type-from-file-header."
+  (should (eq (if (image-type-available-p 'svg) 'svg)
+              (image-type-from-file-header
+               (expand-file-name "splash.svg"
+                                 image-tests--emacs-images-directory)))))
+
+(ert-deftest image-rotate ()
+  "Test `image-rotate'."
+  (cl-letf* ((image (list 'image))
+             ((symbol-function 'image--get-imagemagick-and-warn)
+              (lambda () image)))
+    (let ((current-prefix-arg '(4)))
+      (call-interactively #'image-rotate))
+    (should (equal image '(image :rotation 270.0)))
+    (call-interactively #'image-rotate)
+    (should (equal image '(image :rotation 0.0)))
+    (image-rotate)
+    (should (equal image '(image :rotation 90.0)))
+    (image-rotate 0)
+    (should (equal image '(image :rotation 90.0)))
+    (image-rotate 1)
+    (should (equal image '(image :rotation 91.0)))
+    (image-rotate 1234.5)
+    (should (equal image '(image :rotation 245.5)))
+    (image-rotate -154.5)
+    (should (equal image '(image :rotation 91.0)))))
+
+;;; image-tests.el ends here