diff --git a/dnet-ariadneplus-graphdb-publisher/test/java/eu/dnetlib/ariadneplus/elasticsearch/IndexedJsonTest.java b/dnet-ariadneplus-graphdb-publisher/test/java/eu/dnetlib/ariadneplus/elasticsearch/IndexedJsonTest.java
new file mode 100644
index 0000000..9b58937
--- /dev/null
+++ b/dnet-ariadneplus-graphdb-publisher/test/java/eu/dnetlib/ariadneplus/elasticsearch/IndexedJsonTest.java
@@ -0,0 +1,4 @@
+package eu.dnetlib.ariadneplus.elasticsearch;
+
+public class IndexedJsonTest {
+}
diff --git a/dnet-ariadneplus-graphdb-publisher/test/resources/eu/dnetlib/ariadneplus/elasticsearch/new.json b/dnet-ariadneplus-graphdb-publisher/test/resources/eu/dnetlib/ariadneplus/elasticsearch/new.json
new file mode 100644
index 0000000..e69de29
diff --git a/dnet-ariadneplus-graphdb-publisher/test/resources/eu/dnetlib/ariadneplus/elasticsearch/old.json b/dnet-ariadneplus-graphdb-publisher/test/resources/eu/dnetlib/ariadneplus/elasticsearch/old.json
new file mode 100644
index 0000000..e69de29