diff --git a/src/test/java/org/gcube/resourcemanagement/model/reference/entities/facets/PolymorphismTest.java b/src/test/java/org/gcube/resourcemanagement/model/reference/entities/facets/PolymorphismTest.java
index 2268fa8..e729545 100644
--- a/src/test/java/org/gcube/resourcemanagement/model/reference/entities/facets/PolymorphismTest.java
+++ b/src/test/java/org/gcube/resourcemanagement/model/reference/entities/facets/PolymorphismTest.java
@@ -3,8 +3,11 @@
  */
 package org.gcube.resourcemanagement.model.reference.entities.facets;
 
+import java.io.IOException;
 import java.util.List;
 
+import org.gcube.com.fasterxml.jackson.core.JsonParseException;
+import org.gcube.com.fasterxml.jackson.databind.JsonMappingException;
 import org.gcube.informationsystem.base.reference.Element;
 import org.gcube.informationsystem.base.reference.IdentifiableElement;
 import org.gcube.informationsystem.model.impl.properties.MetadataImpl;
@@ -99,4 +102,11 @@ public class PolymorphismTest {
 		logger.debug(string);
 		
 	}
+	
+	public static final String AUX = "{\"type\":\"Activates\",\"id\":\"6f727f32-4c2d-477f-997b-1f792168875f\",\"propagationConstraint\":{\"type\":\"PropagationConstraint\",\"add\":\"propagate\",\"delete\":\"cascade\",\"remove\":\"cascade\"},\"source\":{\"type\":\"HostingNode\",\"supertypes\":[\"Service\",\"GCubeResource\",\"Resource\"],\"id\":\"1c7e980d-cbd0-4a97-a7b7-2e6f530864c4\"},\"target\":{\"type\":\"EService\",\"id\":\"18854a80-7f72-4655-82cc-22884c912bfe\",\"consistsOf\":[{\"type\":\"IsIdentifiedBy\",\"id\":null,\"propagationConstraint\":{\"type\":\"PropagationConstraint\",\"add\":\"propagate\",\"delete\":\"cascade\",\"remove\":\"cascade\"},\"source\":{\"type\":\"EService\",\"id\":\"18854a80-7f72-4655-82cc-22884c912bfe\"},\"target\":{\"type\":\"SoftwareFacet\",\"id\":null,\"name\":\"gcat\",\"group\":\"org.gcube.data-catalogue\",\"version\":\"2.5.1-SNAPSHOT\",\"description\":\"This service allows any client to publish on the gCube Catalogue.\",\"qualifier\":null,\"optional\":false}},{\"type\":\"ConsistsOf\",\"id\":null,\"propagationConstraint\":{\"type\":\"PropagationConstraint\",\"add\":\"propagate\",\"delete\":\"cascade\",\"remove\":\"cascade\"},\"source\":{\"type\":\"EService\",\"id\":\"18854a80-7f72-4655-82cc-22884c912bfe\"},\"target\":{\"type\":\"AccessPointFacet\",\"id\":null,\"entryName\":\"org.gcube.gcat.ResourceInitializer\",\"endpoint\":\"http://gcat.dev.int.d4science.net:80/gcat\",\"protocol\":null,\"description\":null,\"authorization\":{\"type\":\"ValueSchema\",\"value\":\"gcube-token\",\"schema\":null}}},{\"type\":\"ConsistsOf\",\"id\":null,\"propagationConstraint\":{\"type\":\"PropagationConstraint\",\"add\":\"propagate\",\"delete\":\"cascade\",\"remove\":\"cascade\"},\"source\":{\"type\":\"EService\",\"id\":\"18854a80-7f72-4655-82cc-22884c912bfe\"},\"target\":{\"type\":\"AccessPointFacet\",\"id\":null,\"entryName\":\"gcat-remote-management\",\"endpoint\":\"http://gcat.dev.int.d4science.net:80/gcat/gcube/resource\",\"protocol\":null,\"description\":null,\"authorization\":{\"type\":\"ValueSchema\",\"value\":\"gcube-token\",\"schema\":null}}},{\"type\":\"ConsistsOf\",\"id\":null,\"propagationConstraint\":{\"type\":\"PropagationConstraint\",\"add\":\"propagate\",\"delete\":\"cascade\",\"remove\":\"cascade\"},\"source\":{\"type\":\"EService\",\"id\":\"18854a80-7f72-4655-82cc-22884c912bfe\"},\"target\":{\"type\":\"StateFacet\",\"id\":null,\"value\":\"started\",\"date\":\"2023-05-15 12:36:47.299 +0200\"}},{\"type\":\"ConsistsOf\",\"id\":null,\"propagationConstraint\":{\"type\":\"PropagationConstraint\",\"add\":\"propagate\",\"delete\":\"cascade\",\"remove\":\"cascade\"},\"source\":{\"type\":\"EService\",\"id\":\"18854a80-7f72-4655-82cc-22884c912bfe\"},\"target\":{\"type\":\"EventFacet\",\"id\":null,\"date\":\"2023-05-15 10:36:47.299 +0000\",\"event\":\"started\"}}],\"isRelatedTo\":[]}}"; 
+	
+	@Test
+	public void testUnmarshalling() throws JsonParseException, JsonMappingException, IOException {
+		ElementMapper.unmarshal(Activates.class, AUX);
+	}
 }