diff --git a/test/data/disk.xml b/test/data/disk.xml
new file mode 100644
index 0000000..0263ccc
--- /dev/null
+++ b/test/data/disk.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" standalone="no"?>
+<source_library title="source library">
+  <source name="Disk with Crab spectrum" type="ExtendedSource">
+    <spectrum type="PowerLaw">
+       <parameter name="Prefactor" scale="1e-16" value="5.7"  min="1e-07" max="1000.0" free="1"/>
+       <parameter name="Index"     scale="-1"    value="2.48" min="0.0"   max="+5.0"   free="1"/>
+       <parameter name="Scale"     scale="1e6"   value="0.3"  min="0.01"  max="1000.0" free="0"/>
+    </spectrum>
+    <radialModel type="DiskFunction">
+      <parameter name="RA"     scale="1.0" value="83.6331" min="-360" max="360" free="0"/>
+      <parameter name="DEC"    scale="1.0" value="22.0145" min="-90"  max="90"  free="0"/>
+      <parameter name="Radius" scale="1.0" value="0.45"    min="0.01" max="10"  free="1"/>
+    </radialModel>
+  </source>
+  <source name="Background" type="RadialAcceptance" instrument="CTA">
+    <spectrum type="PowerLaw">
+       <parameter name="Prefactor" scale="1e-6" value="61.8" min="0.0"  max="1000.0" free="1"/>
+       <parameter name="Index"     scale="-1"   value="1.85" min="0.0"  max="+5.0"   free="1"/>
+       <parameter name="Scale"     scale="1e6"  value="1.0"  min="0.01" max="1000.0" free="0"/>
+    </spectrum>
+    <radialModel type="Gaussian">
+       <parameter name="Sigma" scale="1.0" value="3.0" min="0.01" max="10.0" free="1"/>
+    </radialModel>
+  </source>
+</source_library>