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diff --git a/ridljar/test/com/sun/star/lib/util/WeakMap_Test.java b/ridljar/test/com/sun/star/lib/util/WeakMap_Test.java
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+++ b/ridljar/test/com/sun/star/lib/util/WeakMap_Test.java
@@ -0,0 +1,74 @@
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+package com.sun.star.lib.util;
+
+import org.junit.Test;
+import util.WaitUnreachable;
+import static org.junit.Assert.*;
+
+public final class WeakMap_Test {
+    @Test public void test() {
+        WeakMap<String,Object> m = new WeakMap<String,Object>();
+        assertEquals(0, m.size());
+        assertTrue(m.isEmpty());
+        assertFalse(m.containsKey("key1"));
+        assertFalse(m.containsValue(null));
+        WaitUnreachable u1 = new WaitUnreachable(new Object());
+        m.put("key1", u1.get());
+        WaitUnreachable u2 = new WaitUnreachable(new Disposable());
+        m.put("key2", u2.get());
+        assertEquals(2, m.size());
+        assertFalse(m.isEmpty());
+        assertTrue(m.containsKey("key1"));
+        assertTrue(m.containsKey("key2"));
+        assertFalse(m.containsKey("key3"));
+        assertTrue(m.containsValue(m.get("key1")));
+        assertTrue(m.containsValue(m.get("key2")));
+        assertEquals(u1.get(), WeakMap.getValue(m.get("key1")));
+        assertEquals(u2.get(), WeakMap.getValue(m.get("key2")));
+        assertEquals(2, m.values().size());
+        assertTrue(m.values().contains(m.get("key1")));
+        assertTrue(m.values().contains(m.get("key2")));
+        u1.waitUnreachable();
+        assertNull(WeakMap.getValue(m.get("key1")));
+        ((Disposable) u2.get()).dispose();
+        assertNull(WeakMap.getValue(m.get("key2")));
+        m.clear();
+        u2.waitUnreachable();
+        assertEquals(0, m.size());
+        m.put("key2", new Object());
+        assertEquals(1, m.size());
+    }
+
+    // This simple class (single listener, no synchronization) exploits
+    // knowledge about the implementation of WeakMap:
+    private static final class Disposable implements DisposeNotifier {
+        public void addDisposeListener(DisposeListener listener) {
+            this.listener = listener;
+        }
+
+        public void dispose() {
+            if (listener != null) {
+                listener.notifyDispose(this);
+            }
+        }
+
+        private DisposeListener listener = null;
+    }
+}