[gegl] tests: add a test case for stretch-contrast

[Téo Mazars <teom src gnome org>]

commit e0856a4c3f1a0a2c37e513cd36b529d7110c3a29
Author: Téo Mazars <teo mazars ensimag fr>
Date:   Thu Oct 24 15:51:42 2013 +0200

    tests: add a test case for stretch-contrast

 tests/compositions/Makefile.am                    |    1 +
 tests/compositions/data/mid_grey_dot.png          |  Bin 0 -> 672 bytes
 tests/compositions/reference/stretch-contrast.png |  Bin 0 -> 3358 bytes
 tests/compositions/stretch-contrast.xml           |   11 +++++++++++
 4 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/tests/compositions/Makefile.am b/tests/compositions/Makefile.am
index 2fdddf7..c18837d 100644
--- a/tests/compositions/Makefile.am
+++ b/tests/compositions/Makefile.am
@@ -35,6 +35,7 @@ TESTS = \
   rotate.xml                      \
   simple-scale.xml                \
   softglow.xml                    \
+  stretch-contrast.xml            \
   transform.xml                   \
   rectangles.xml
 
diff --git a/tests/compositions/data/mid_grey_dot.png b/tests/compositions/data/mid_grey_dot.png
new file mode 100644
index 0000000..a1e6eca
Binary files /dev/null and b/tests/compositions/data/mid_grey_dot.png differ
diff --git a/tests/compositions/reference/stretch-contrast.png 
b/tests/compositions/reference/stretch-contrast.png
new file mode 100644
index 0000000..0bb55c0
Binary files /dev/null and b/tests/compositions/reference/stretch-contrast.png differ
diff --git a/tests/compositions/stretch-contrast.xml b/tests/compositions/stretch-contrast.xml
new file mode 100644
index 0000000..dd9ea8b
--- /dev/null
+++ b/tests/compositions/stretch-contrast.xml
@@ -0,0 +1,11 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<gegl>
+  <node operation='gegl:stretch-contrast'>
+  </node>
+  <node operation='gegl:load'>
+    <params>
+      <param name='path'>data/mid_grey_dot.png</param>
+    </params>
+  </node>
+</gegl>
+