add antunit as test dependency
diff --git a/ivy.xml b/ivy.xml
index 88d170d..c31ca03 100644
--- a/ivy.xml
+++ b/ivy.xml
@@ -60,5 +60,7 @@
     <dependency org="org.tukaani" name="xz" rev="1.8" conf="default"/>
     <dependency org="org.brotli" name="dec" rev="0.1.2" conf="default"/>
     <dependency org="junit" name="junit" rev="4.12" conf="test->default"/>
+    <dependency org="org.apache.ant" name="ant-antunit" rev="1.3"
+                conf="test->default" transitive="false"  />
   </dependencies>
 </ivy-module>