diff --git a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/hostedbymap/TestPreprocess.scala b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/hostedbymap/TestPreprocess.scala
index 2ed76a72a..5b00e9b6f 100644
--- a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/hostedbymap/TestPreprocess.scala
+++ b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/hostedbymap/TestPreprocess.scala
@@ -1,6 +1,5 @@
 package eu.dnetlib.dhp.oa.graph.hostedbymap
 
-import eu.dnetlib.dhp.oa.graph.hostedbymap.{Aggregators, Constants, HostedByInfo, HostedByItemType, SparkProduceHostedByMap}
 import eu.dnetlib.dhp.schema.oaf.Datasource
 import org.apache.spark.SparkConf
 import org.apache.spark.sql.{Dataset, Encoder, Encoders, SparkSession}