Test exif.heic and exif.png in tests/rwrcmp.rs.

tests/rwrcmp.rs

@@ -40,11 +40,21 @@ use exif::Error;
 use exif::{Exif, In, Reader, Value, Tag};
 use exif::experimental::Writer;
 
+#[test]
+fn exif_heic() {
+    rwr_compare("tests/exif.heic");
+}
+
 #[test]
 fn exif_jpg() {
     rwr_compare("tests/exif.jpg");
 }
 
+#[test]
+fn exif_png() {
+    rwr_compare("tests/exif.png");
+}
+
 #[test]
 fn exif_tif() {
     rwr_compare("tests/exif.tif");