--- /dev/null	2018-04-07 16:19:29.000000000 +0530
+++ new/test/jdk/javax/swing/JComboBox/DefaultComboBoxModelAddAllElementsTest.java	2018-04-07 16:19:16.150089600 +0530
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 4842658
+ * @summary Tests the addAllElements, addAllElementsAt methods of DefaultComboBoxModel.
+ * @run main DefaultComboBoxModelAddAllElementsTest
+ */
+import javax.swing.DefaultComboBoxModel;
+import javax.swing.event.ListDataEvent;
+import javax.swing.event.ListDataListener;
+import java.util.ArrayList;
+import java.util.TreeSet;
+import java.util.Vector;
+import java.util.stream.IntStream;
+
+
+public class DefaultComboBoxModelAddAllElementsTest {
+    private static final int START = 0;
+    private static final int END = 50;
+    private static final Vector<Integer> vector =
+            IntStream.range(START, END).collect(Vector::new,
+                    Vector::add,
+                    Vector::addAll);
+
+    private static final TreeSet<Integer> set =
+            IntStream.range(START, END).collect(TreeSet::new,
+                    TreeSet::add,
+                    TreeSet::addAll);
+
+    private static final ArrayList<Integer> arrayList =
+            IntStream.range(START, END).collect(ArrayList::new,
+                    ArrayList::add,
+                    ArrayList::addAll);
+
+    public static void main(String[] args) {
+        checkAddAll();
+        checkAddAllWithIndex();
+        System.out.println("Test case passed.");
+    }
+
+    private static class MyListDataListener implements ListDataListener {
+        @Override public void intervalAdded(ListDataEvent e) {
+            if (e.getIndex1() - e.getIndex0() != END - START) {
+                throw new RuntimeException("Test case failed. Expected " + (END - START) +
+                        " elements to be added, but only got " + (e.getIndex1() - e.getIndex0()));
+            }
+        }
+
+        @Override public void intervalRemoved(ListDataEvent e) {}
+        @Override public void contentsChanged(ListDataEvent e) {}
+    }
+
+    private static void checkAddAll() {
+        DefaultComboBoxModel<Integer> lm = new DefaultComboBoxModel<>();
+        lm.addListDataListener(new MyListDataListener());
+
+        try {
+            lm.addElements(arrayList);
+            System.out.println("Successfully added " + (END - START) + "elements.");
+        } catch (Exception e) {
+            throw new RuntimeException("Test case failed. " + e.getMessage());
+        }
+    }
+
+    private static void checkAddAllWithIndex() {
+        DefaultComboBoxModel<Integer> cm = new DefaultComboBoxModel<>();
+
+        cm.addListDataListener(new MyListDataListener());
+        cm.addElements(set);
+
+        try {
+            cm.addElementsAt(START - 1, vector);
+            throw new RuntimeException("Test case failed. Expected failure not reported.");
+        } catch (IllegalArgumentException e){
+            System.out.println("Encountered exception as expected, when trying to add elements" +
+                    "before the start of the list.");
+        }
+
+        try {
+            cm.addElementsAt(15, vector);
+            System.out.println("Successfully added elements at a particular index");
+        } catch (Exception e) {
+            throw new RuntimeException("Unexpected failure: " + e.getMessage());
+        }
+
+        try {
+            cm.addElementsAt(END + END + 1, vector);
+            throw new RuntimeException("Test case failed. Expected failure not reported.");
+        } catch (IllegalArgumentException e){
+            System.out.println("Encountered exception as expected, when trying to add elements" +
+                    "after the end of the list.");
+        }
+    }
+}