Index: trunk/test/unit/org/openstreetmap/josm/actions/UnJoinNodeWayActionTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/actions/UnJoinNodeWayActionTest.java	(revision 8294)
+++ trunk/test/unit/org/openstreetmap/josm/actions/UnJoinNodeWayActionTest.java	(revision 8294)
@@ -0,0 +1,87 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.actions;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.Arrays;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.openstreetmap.josm.JOSMFixture;
+import org.openstreetmap.josm.Main;
+import org.openstreetmap.josm.data.coor.EastNorth;
+import org.openstreetmap.josm.data.osm.DataSet;
+import org.openstreetmap.josm.data.osm.Node;
+import org.openstreetmap.josm.data.osm.Way;
+import org.openstreetmap.josm.gui.layer.OsmDataLayer;
+
+/**
+ * Unit tests for class UnJoinNodeWayAction.
+ */
+public final class UnJoinNodeWayActionTest {
+
+    /**
+     * Prepare the class for the test. The notification system must be disabled.
+     */
+    public class UnJoinNodeWayActionTestClass extends UnJoinNodeWayAction {
+
+        /**
+         * Disable notification.
+         */
+        @Override
+        public void notify(String msg, int messageType) {
+            return;
+        };
+    }
+
+    /**
+     * Setup test.
+     */
+    @BeforeClass
+    public static void setUp() {
+        JOSMFixture.createUnitTestFixture().init(true);
+    }
+
+    /**
+     * Test case: Ignore irrelevant nodes
+     * We create a three node way, then try to remove central node while another
+     * node outside is selected.
+     * see #10396
+     */
+    @Test
+    public void test10396() {
+        DataSet dataSet = new DataSet();
+        OsmDataLayer layer = new OsmDataLayer(dataSet, OsmDataLayer.createNewName(), null);
+
+        Node n1 = new Node(new EastNorth(-1, -1));
+        Node n2 = new Node(new EastNorth(0, 0));
+        Node n3 = new Node(new EastNorth(1, -1));
+        Node n4 = new Node(new EastNorth(0, 1));
+        dataSet.addPrimitive(n1);
+        dataSet.addPrimitive(n2);
+        dataSet.addPrimitive(n3);
+        dataSet.addPrimitive(n4);
+
+        Way w = new Way();
+        w.setNodes(Arrays.asList(new Node[] {n1, n2, n3}));
+        dataSet.addPrimitive(w);
+
+        dataSet.addSelected(n2);
+        dataSet.addSelected(n4);
+        dataSet.addSelected(w);
+
+        UnJoinNodeWayActionTestClass action = new UnJoinNodeWayActionTestClass();
+        action.setEnabled(true);
+        try {
+            Main.main.addLayer(layer);
+            action.actionPerformed(null);
+        } finally {
+            // Ensure we clean the place before leaving, even if test fails.
+            Main.map.mapView.removeLayer(layer);
+        }
+
+        // Ensures node n2 remove from w
+        assertTrue("Node n2 wasn't removed from way w.",
+                   !w.containsNode(n2));
+    }
+}