Index: trunk/test/unit/org/openstreetmap/josm/gui/datatransfer/LayerTransferableTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/gui/datatransfer/LayerTransferableTest.java	(revision 10605)
+++ trunk/test/unit/org/openstreetmap/josm/gui/datatransfer/LayerTransferableTest.java	(revision 10605)
@@ -0,0 +1,98 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.gui.datatransfer;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertTrue;
+
+import java.awt.datatransfer.DataFlavor;
+import java.awt.datatransfer.UnsupportedFlavorException;
+import java.util.Arrays;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.openstreetmap.josm.gui.datatransfer.LayerTransferable.Data;
+import org.openstreetmap.josm.gui.layer.Layer;
+import org.openstreetmap.josm.gui.layer.LayerManagerTest;
+import org.openstreetmap.josm.gui.layer.LayerManagerTest.TestLayer;
+import org.openstreetmap.josm.gui.layer.MainLayerManager;
+
+/**
+ * Tests for {@link LayerTransferable}
+ * @author Michael Zangl
+ * @since 10605
+ */
+public class LayerTransferableTest {
+    private TestLayer layer1;
+    private TestLayer layer2;
+    private MainLayerManager manager;
+
+    /**
+     * Set up test data
+     */
+    @Before
+    public void createTestData() {
+        layer1 = new LayerManagerTest.TestLayer();
+        layer2 = new LayerManagerTest.TestLayer();
+        manager = new MainLayerManager();
+        manager.addLayer(layer1);
+        manager.addLayer(layer2);
+    }
+
+    /**
+     * Test {@link LayerTransferable.Data}
+     */
+    @Test
+    public void testLayerData() {
+        Data data = new Data(manager, Arrays.<Layer>asList(layer1, layer2));
+
+        // need to be identity
+        assertSame(manager, data.getManager());
+        assertSame(layer1, data.getLayers().get(0));
+        assertSame(layer2, data.getLayers().get(1));
+    }
+
+    /**
+     * Test {@link LayerTransferable#isDataFlavorSupported(java.awt.datatransfer.DataFlavor)}
+     * and {@link LayerTransferable#getTransferDataFlavors()}
+     */
+    @Test
+    public void testSupportedDataFlavor() {
+        LayerTransferable transferable = new LayerTransferable(manager, Arrays.<Layer>asList(layer1, layer2));
+
+        assertFalse(transferable.isDataFlavorSupported(DataFlavor.imageFlavor));
+        assertTrue(transferable.isDataFlavorSupported(LayerTransferable.LAYER_DATA));
+
+        DataFlavor[] flavors = transferable.getTransferDataFlavors();
+        assertEquals(1, flavors.length);
+        assertEquals(LayerTransferable.LAYER_DATA, flavors[0]);
+    }
+
+    /**
+     * Test {@link LayerTransferable#getTransferData(DataFlavor)}
+     * @throws Exception if any error occurs
+     */
+    @Test
+    public void testTransferData() throws Exception {
+        LayerTransferable transferable = new LayerTransferable(manager, Arrays.<Layer>asList(layer1, layer2));
+
+        Object object = transferable.getTransferData(LayerTransferable.LAYER_DATA);
+        assertTrue(object instanceof Data);
+        Data data = (Data) object;
+        assertSame(manager, data.getManager());
+        assertSame(layer1, data.getLayers().get(0));
+        assertSame(layer2, data.getLayers().get(1));
+    }
+
+    /**
+     * Test {@link LayerTransferable#getTransferData(DataFlavor)} for unsupported {@link DataFlavor}
+     * @throws Exception if any error occurs
+     */
+    @Test(expected = UnsupportedFlavorException.class)
+    public void testTransferDataUnsupported() throws Exception {
+        LayerTransferable transferable = new LayerTransferable(manager, Arrays.<Layer>asList(layer1, layer2));
+
+        transferable.getTransferData(DataFlavor.imageFlavor);
+    }
+}