Index: trunk/test/unit/org/openstreetmap/josm/gui/layer/OsmDataLayerTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/gui/layer/OsmDataLayerTest.java	(revision 11024)
+++ trunk/test/unit/org/openstreetmap/josm/gui/layer/OsmDataLayerTest.java	(revision 11033)
@@ -10,4 +10,5 @@
 import java.io.File;
 
+import org.fest.assertions.Assertions;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -254,3 +255,11 @@
         assertTrue(layer.checkSaveConditions());
     }
+
+    @Test
+    public void testLayerNameIncreases() throws Exception {
+        final OsmDataLayer layer1 = new OsmDataLayer(new DataSet(), OsmDataLayer.createLayerName(147), null);
+        final OsmDataLayer layer2 = new OsmDataLayer(new DataSet(), OsmDataLayer.createNewName(), null);
+        assertEquals("Data Layer 147", layer1.getName());
+        assertEquals("Data Layer 148", layer2.getName());
+    }
 }