Index: applications/editors/josm/plugins/mapillary/test/unit/org/openstreetmap/josm/plugins/mapillary/MapillaryTrafficSignLayerTest.java
===================================================================
--- applications/editors/josm/plugins/mapillary/test/unit/org/openstreetmap/josm/plugins/mapillary/MapillaryTrafficSignLayerTest.java	(revision 31799)
+++ applications/editors/josm/plugins/mapillary/test/unit/org/openstreetmap/josm/plugins/mapillary/MapillaryTrafficSignLayerTest.java	(revision 31799)
@@ -0,0 +1,26 @@
+package org.openstreetmap.josm.plugins.mapillary;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotEquals;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.openstreetmap.josm.data.imagery.ImageryInfo;
+import org.openstreetmap.josm.gui.layer.ImageryLayer;
+import org.openstreetmap.josm.gui.layer.Layer;
+
+public class MapillaryTrafficSignLayerTest extends AbstractTest {
+  private Layer dummyLayer = ImageryLayer.create(new ImageryInfo());
+
+  @Test
+  public void test() throws IOException {
+    assertFalse(MapillaryTrafficSignLayer.getInstance().isModified());
+    assertFalse(MapillaryTrafficSignLayer.getInstance().isMergable(dummyLayer));
+    assertFalse(MapillaryTrafficSignLayer.getInstance().isMergable(MapillaryTrafficSignLayer.getInstance()));
+    assertEquals(MapillaryPlugin.ICON16, MapillaryTrafficSignLayer.getInstance().getIcon());
+    assertEquals(null, MapillaryTrafficSignLayer.getInstance().getToolTipText());
+    assertNotEquals(null, MapillaryTrafficSignLayer.getInstance().getInfoComponent());
+  }
+}
Index: applications/editors/josm/plugins/mapillary/test/unit/org/openstreetmap/josm/plugins/mapillary/io/download/MapillarySequenceDownloadThreadTest.java
===================================================================
--- applications/editors/josm/plugins/mapillary/test/unit/org/openstreetmap/josm/plugins/mapillary/io/download/MapillarySequenceDownloadThreadTest.java	(revision 31797)
+++ applications/editors/josm/plugins/mapillary/test/unit/org/openstreetmap/josm/plugins/mapillary/io/download/MapillarySequenceDownloadThreadTest.java	(revision 31799)
@@ -15,4 +15,5 @@
 import org.openstreetmap.josm.plugins.mapillary.AbstractTest;
 import org.openstreetmap.josm.plugins.mapillary.MapillaryLayer;
+import org.openstreetmap.josm.plugins.mapillary.MapillaryPlugin;
 import org.openstreetmap.josm.plugins.mapillary.io.download.MapillaryDownloader;
 import org.openstreetmap.josm.plugins.mapillary.io.download.MapillarySequenceDownloadThread;
@@ -47,5 +48,5 @@
             "?max_lat=%.8f&max_lon=%.8f&min_lat=%.8f&min_lon=%.8f&limit=10&client_id=%s",
             maxLatLon.lat(), maxLatLon.lon(), minLatLon.lat(), minLatLon.lon(),
-            MapillaryDownloader.CLIENT_ID);
+            MapillaryPlugin.CLIENT_ID);
     MapillaryLayer.getInstance().getData().bounds.add(new Bounds(minLatLon,
         maxLatLon));
Index: applications/editors/josm/plugins/mapillary/test/unit/org/openstreetmap/josm/plugins/mapillary/utils/MapillaryUtilsTest.java
===================================================================
--- applications/editors/josm/plugins/mapillary/test/unit/org/openstreetmap/josm/plugins/mapillary/utils/MapillaryUtilsTest.java	(revision 31797)
+++ applications/editors/josm/plugins/mapillary/test/unit/org/openstreetmap/josm/plugins/mapillary/utils/MapillaryUtilsTest.java	(revision 31799)
@@ -15,4 +15,9 @@
  */
 public class MapillaryUtilsTest {
+
+  @Test
+  public void testUtilityClass() {
+    TestUtil.testUtilityClass(MapillaryUtils.class);
+  }
 
   /**