Test gifload in make check and on Travis CI

.travis.yml

@@ -8,7 +8,7 @@ before_install:
   - sudo apt-get install swig libmagick++-dev bc 
   - sudo apt-get install libcfitsio3-dev libgsl0-dev libmatio-dev
   - sudo apt-get install liborc-0.4-dev liblcms2-dev libpoppler-glib-dev
-  - sudo apt-get install librsvg2-dev
+  - sudo apt-get install librsvg2-dev libgif-dev
 before_script:
   - ./bootstrap.sh
   - ./configure 

test/test_formats.sh

@@ -15,6 +15,10 @@ poppler_ref=$test_images/blankpage.png
 rsvg=$test_images/blankpage.svg
 rsvg_ref=$test_images/blankpage.png
 
+# giflib / gifload reference image
+giflib=$test_images/trans-x.gif
+giflib_ref=$test_images/trans-x.png
+
 # the matlab image and reference image
 matlab=$test_images/sample.mat
 matlab_ref=$test_images/sample.png
@@ -230,6 +234,10 @@ if test_supported svgload; then
 	test_loader $rsvg_ref $rsvg svgload
 fi
 
+if test_supported gifload; then
+	test_loader $giflib_ref $giflib gifload
+fi
+
 if test_supported matload; then
 	test_loader $matlab_ref $matlab matlab
 fi