Index: trunk/test/unit/org/openstreetmap/josm/gui/TableCellRendererTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/gui/TableCellRendererTest.java	(revision 10072)
+++ trunk/test/unit/org/openstreetmap/josm/gui/TableCellRendererTest.java	(revision 10079)
@@ -32,11 +32,12 @@
  * value to check if a NPE is thrown.
  *
- * @see #6301
+ * @see <a href="https://josm.openstreetmap.de/ticket/6301">#6301</a>
  */
 public class TableCellRendererTest {
 
-    // list of classes that cannot be easily tested and are verified manually
+    // list of classes that cannot be easily tested and are verified either manually or another unit tests
     private static final Collection<String> SKIP_TEST = Arrays.asList(
-        "org.openstreetmap.josm.gui.dialogs.FilterDialog$BooleanRenderer"
+        "org.openstreetmap.josm.gui.dialogs.FilterDialog$BooleanRenderer",
+        "org.openstreetmap.josm.gui.dialogs.relation.SelectionTableCellRenderer"
     );
 
@@ -49,4 +50,7 @@
     }
 
+    /**
+     * Unit test of all table cell renderers against null values.
+     */
     @Test
     public void tableCellRendererTest() {