Index: trunk/test/unit/org/openstreetmap/josm/gui/layer/LayerPositionStrategyTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/gui/layer/LayerPositionStrategyTest.java	(revision 11008)
+++ trunk/test/unit/org/openstreetmap/josm/gui/layer/LayerPositionStrategyTest.java	(revision 11008)
@@ -0,0 +1,21 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.gui.layer;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+/**
+ * Test the {@link LayerPositionStrategy} class.
+ */
+public class LayerPositionStrategyTest {
+
+    /**
+     * Test of robustness against null manager.
+     */
+    @Test
+    public void testNullManager() {
+        assertEquals(0, LayerPositionStrategy.inFrontOfFirst(l -> true).getPosition(null));
+        assertEquals(0, LayerPositionStrategy.afterLast(l -> true).getPosition(null));
+    }
+}