[gegl] tests: add a test case for posterize

[Téo Mazars <teom src gnome org>]

commit d894c6ad4262cccbfdb982ead4c72e12cbf5d028
Author: Téo Mazars <teo mazars ensimag fr>
Date:   Sun Oct 27 14:46:37 2013 +0100

    tests: add a test case for posterize

 tests/compositions/Makefile.am             |    1 +
 tests/compositions/posterize.xml           |   13 +++++++++++++
 tests/compositions/reference/posterize.png |  Bin 0 -> 300303 bytes
 3 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/tests/compositions/Makefile.am b/tests/compositions/Makefile.am
index c18837d..e5fc9b2 100644
--- a/tests/compositions/Makefile.am
+++ b/tests/compositions/Makefile.am
@@ -28,6 +28,7 @@ TESTS = \
   image-compare.xml               \
   mantiuk06.xml                   \
   pixelize.xml                    \
+  posterize.xml                   \
   reflect.xml                     \
   reflect2.xml                    \
   reinhard05.xml                  \
diff --git a/tests/compositions/posterize.xml b/tests/compositions/posterize.xml
new file mode 100644
index 0000000..ec6e7a8
--- /dev/null
+++ b/tests/compositions/posterize.xml
@@ -0,0 +1,13 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<gegl>
+  <node operation='gegl:posterize'>
+    <params>
+      <param name='levels'>8</param>
+    </params>
+  </node>
+  <node operation='gegl:load'>
+    <params>
+      <param name='path'>data/car-stack.png</param>
+    </params>
+  </node>
+</gegl>
diff --git a/tests/compositions/reference/posterize.png b/tests/compositions/reference/posterize.png
new file mode 100644
index 0000000..ec9440c
Binary files /dev/null and b/tests/compositions/reference/posterize.png differ