diff --git a/src/test/java/org/gcube/gcat/persistence/ckan/CKANGroupTest.java b/src/test/java/org/gcube/gcat/persistence/ckan/CKANGroupTest.java
index 889ee64..2c2b3c3 100644
--- a/src/test/java/org/gcube/gcat/persistence/ckan/CKANGroupTest.java
+++ b/src/test/java/org/gcube/gcat/persistence/ckan/CKANGroupTest.java
@@ -1,7 +1,6 @@
 package org.gcube.gcat.persistence.ckan;
 
-import java.util.ArrayList;
-import java.util.Iterator;
+import java.util.Arrays;
 import java.util.List;
 
 import org.gcube.gcat.ContextTest;
@@ -9,7 +8,6 @@ import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 public class CKANGroupTest extends ContextTest {
@@ -34,17 +32,11 @@ public class CKANGroupTest extends ContextTest {
 	}
 	
 	public static List<String> listGroup() throws Exception {
-		List<String> groupList = new ArrayList<>();
 		CKANGroup group = new CKANGroup();
 		String groups = group.list(1000, 0);
 		ObjectMapper objectMapper = new ObjectMapper();
-		JsonNode jsonNodeGroups = objectMapper.readTree(groups);
-		Iterator<JsonNode> iterator = jsonNodeGroups.elements();
-		while(iterator.hasNext()) {
-			JsonNode jsonNode = iterator.next();
-			groupList.add(jsonNode.asText());
-		}
-		return groupList;
+		String[] groupArray = objectMapper.readValue(groups, String[].class);
+		return Arrays.asList(groupArray);
 	}
 	
 	@Test