Index: trunk/test/unit/org/openstreetmap/josm/gui/dialogs/LayerListDialogTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/gui/dialogs/LayerListDialogTest.java	(revision 9926)
+++ trunk/test/unit/org/openstreetmap/josm/gui/dialogs/LayerListDialogTest.java	(revision 9926)
@@ -0,0 +1,71 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.gui.dialogs;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.openstreetmap.josm.JOSMFixture;
+import org.openstreetmap.josm.Main;
+import org.openstreetmap.josm.gui.dialogs.LayerListDialog.LayerGammaAction;
+import org.openstreetmap.josm.gui.dialogs.LayerListDialog.LayerListModel;
+import org.openstreetmap.josm.gui.dialogs.LayerListDialog.LayerOpacityAction;
+import org.openstreetmap.josm.gui.layer.TMSLayer;
+import org.openstreetmap.josm.gui.layer.TMSLayerTest;
+
+/**
+ * Unit tests of {@link LayerListDialog} class.
+ */
+public class LayerListDialogTest {
+
+    /**
+     * Setup tests
+     */
+    @BeforeClass
+    public static void setUpBeforeClass() {
+        JOSMFixture.createUnitTestFixture().init(true);
+    }
+
+    /**
+     * Unit test of {@link LayerGammaAction} class.
+     */
+    @Test
+    public void testLayerGammaAction() {
+        TMSLayer layer = TMSLayerTest.createTmsLayer();
+        try {
+            Main.map.mapView.addLayer(layer);
+            LayerListModel model = LayerListDialog.getInstance().getModel();
+            LayerGammaAction action = new LayerGammaAction(model);
+            action.updateEnabledState();
+            assertTrue(action.isEnabled());
+            assertTrue(action.supportLayers(model.getSelectedLayers()));
+            assertEquals(1.0, action.getValue(), 1e-15);
+            action.setValue(0.5);
+            assertEquals(0.5, action.getValue(), 1e-15);
+        } finally {
+            Main.map.mapView.removeLayer(layer);
+        }
+    }
+
+    /**
+     * Unit test of {@link LayerOpacityAction} class.
+     */
+    @Test
+    public void testLayerOpacityAction() {
+        TMSLayer layer = TMSLayerTest.createTmsLayer();
+        try {
+            Main.map.mapView.addLayer(layer);
+            LayerListModel model = LayerListDialog.getInstance().getModel();
+            LayerOpacityAction action = new LayerOpacityAction(model);
+            action.updateEnabledState();
+            assertTrue(action.isEnabled());
+            assertTrue(action.supportLayers(model.getSelectedLayers()));
+            assertEquals(1.0, action.getValue(), 1e-15);
+            action.setValue(0.5);
+            assertEquals(0.5, action.getValue(), 1e-15);
+        } finally {
+            Main.map.mapView.removeLayer(layer);
+        }
+    }
+}