--- a/gwt-client/src/test/java/test/SimpleRecommendation.java	Tue Jun 12 10:40:33 2018 +0200
+++ b/gwt-client/src/test/java/test/SimpleRecommendation.java	Tue Jun 12 15:04:40 2018 +0200
@@ -9,6 +9,20 @@
  */
 package test;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+
+import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
+import org.dive4elements.river.client.client.ui.NilDatacageTwinPanelInfo;
+import org.dive4elements.river.client.client.ui.RecommandationUtils;
+import org.dive4elements.river.client.server.ArtifactHelper;
+import org.dive4elements.river.client.server.CollectionHelper;
+import org.dive4elements.river.client.server.LoadArtifactServiceImpl;
+import org.dive4elements.river.client.shared.exceptions.ServerException;
+import org.dive4elements.river.client.shared.model.Artifact;
+import org.dive4elements.river.client.shared.model.Collection;
+import org.dive4elements.river.client.shared.model.Recommendation;
+
 /**
  * @author Domenico Nardi Tironi
  *
@@ -19,6 +33,7 @@
     private final String factory;
     private final String ids;
     private final String target;
+    private String displayName;
 
     public SimpleRecommendation(final String factory, final String ids, final String target) {
         this.factory = factory;
@@ -26,6 +41,11 @@
         this.target = target;
     }
 
+    public SimpleRecommendation(final String factory, final String ids, final String target, final String displayName) {
+        this(factory, ids, target);
+        this.displayName = displayName;
+    }
+
     public String getIds() {
         return this.ids;
     }
@@ -38,4 +58,56 @@
         return this.factory;
     }
 
+    private String getDisplayName() {
+        return this.displayName;
+    }
+
+    public final String getRecommendationPairString(final SimpleRecommendation rec2, final Collection collection, final String serverUrl, final String locale)
+            throws ConnectionException, ServerException {
+        final Recommendation recom1 = new Recommendation(this.getFactory(), this.getIds(), this.getTarget());
+        recom1.setDisplayName(this.displayName);
+        final Recommendation recom2 = new Recommendation(rec2.getFactory(), rec2.getIds(), rec2.getTarget());
+        recom2.setDisplayName(rec2.getDisplayName());
+        final Artifact[] artifacts = loadMany(new Recommendation[] { recom1, recom2 }, null, collection, serverUrl, locale);
+        final String rec1String = RecommandationUtils.createDataString(artifacts[0].getUuid(), recom1, new NilDatacageTwinPanelInfo("xxxx"));
+        final String rec2String = RecommandationUtils.createDataString(artifacts[1].getUuid(), recom2, new NilDatacageTwinPanelInfo("xxxx"));
+        final String combinedIdNeu = rec1String + "#" + rec2String;
+        return combinedIdNeu;
+
+    }
+
+    private final Artifact[] loadMany(final Recommendation[] recoms, final String factory, final Collection collection, final String serverUrl,
+            final String locale) throws ServerException, ConnectionException {
+        final ArrayList<Artifact> artifacts = new ArrayList<Artifact>();
+        final HashMap<Recommendation, Artifact> cloneMap = new HashMap<Recommendation, Artifact>();
+
+        for (final Recommendation recom : recoms) {
+
+            final Artifact prevClone = cloneMap.get(recom);
+            if (prevClone != null) {
+
+                artifacts.add(prevClone);
+            } else {
+                // Not already cloned.
+                final String realFactory = factory != null ? factory : recom.getFactory();
+
+                final Artifact clone = ArtifactHelper.createArtifact(serverUrl, locale, realFactory, recom);
+
+                if (clone != null) {
+                    final Collection c = CollectionHelper.addArtifact(collection, clone, serverUrl, locale);
+
+                    if (c != null) {
+                        artifacts.add(clone);
+                        // Remember we cloned a recommendation like this.
+                        cloneMap.put(recom, clone);
+                    } else {
+                        throw new ServerException(LoadArtifactServiceImpl.ERROR_LOAD_ARTIFACT);
+                    }
+                }
+            }
+        }
+        return artifacts.toArray(new Artifact[artifacts.size()]);
+
+    }
+
 }