Add tests for image-supported-file-p

* test/lisp/image-tests.el (image-type-from-file-name): Suppress
obsoletion warnings for test.
(image-supported-file-p/built-in)
(image-supported-file-p/optional)
(image-supported-file-p/unsupported-returns-nil): New tests.

1 files changed, 12 insertions, 0 deletions

diff --git a/test/lisp/image-tests.el b/test/lisp/image-tests.el
index 2b3e818d720..908df09f15f 100644
--- a/test/lisp/image-tests.el
+++ b/test/lisp/image-tests.el
@@ -74,6 +74,18 @@
   (should (listp (find-image '((:type png :file "newsticker/rss-feed.png" :ascent center)))))
   (should-not (find-image '((:type png :file "does-not-exist-foo-bar.png")))))
 
+(ert-deftest image-supported-file-p/built-in ()
+  ;; (skip-unless (image-type-available-p 'pbm)) ; always built-in
+  (should (eq (image-supported-file-p "foo.pbm") 'pbm)))
+
+(ert-deftest image-supported-file-p/optional ()
+  (if (image-type-available-p 'jpeg)
+      (should (eq (image-supported-file-p "foo.jpg") 'jpeg))
+    (should-not (image-supported-file-p "foo.jpg"))))
+
+(ert-deftest image-supported-file-p/unsupported-returns-nil ()
+  (should-not (image-supported-file-p "foo.some-unsupported-format")))
+
 (ert-deftest image-type-from-file-name ()
   (with-suppressed-warnings ((obsolete image-type-from-file-name))
     (should (eq (image-type-from-file-name "foo.jpg") 'jpeg))