Index: trunk/test/unit/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditorTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditorTest.java	(revision 9438)
+++ trunk/test/unit/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditorTest.java	(revision 9438)
@@ -0,0 +1,43 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.gui.dialogs.relation;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+
+import java.util.Collections;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.openstreetmap.josm.JOSMFixture;
+import org.openstreetmap.josm.data.osm.Node;
+import org.openstreetmap.josm.data.osm.OsmPrimitive;
+import org.openstreetmap.josm.data.osm.Relation;
+import org.openstreetmap.josm.data.osm.Way;
+
+/**
+ * Unit tests of {@link GenericRelationEditor} class.
+ */
+public class GenericRelationEditorTest {
+
+    /**
+     * Setup test.
+     */
+    @BeforeClass
+    public static void setUpBeforeClass() {
+        JOSMFixture.createUnitTestFixture().init();
+    }
+
+    /**
+     * Unit test of {@link GenericRelationEditor#addPrimitivesToRelation}.
+     */
+    @Test
+    public void testAddPrimitivesToRelation() {
+        assertNull(GenericRelationEditor.addPrimitivesToRelation(new Relation(1), Collections.<OsmPrimitive>emptyList()));
+        assertNull(GenericRelationEditor.addPrimitivesToRelation(new Relation(1), Collections.singleton(new Relation(1))));
+
+        assertNotNull(GenericRelationEditor.addPrimitivesToRelation(new Relation(1), Collections.singleton(new Node(1))));
+        assertNotNull(GenericRelationEditor.addPrimitivesToRelation(new Relation(1), Collections.singleton(new Way(1))));
+        assertNotNull(GenericRelationEditor.addPrimitivesToRelation(new Relation(1), Collections.singleton(new Relation(2))));
+    }
+
+}