--- /dev/null	2016-04-20 08:08:33.338582638 +0200
+++ new/test/java/lang/reflect/WeakPairMap/java.base/java/lang/reflect/WeakPairMapTest.java	2016-04-21 17:34:10.569044363 +0200
@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2016, 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.
+ */
+
+package java.lang.reflect;
+
+import java.lang.ref.Reference;
+import java.util.Objects;
+
+/**
+ * Functional test for WeakPairMap
+ *
+ * @author Peter Levart
+ */
+public class WeakPairMapTest {
+    public static void main(String[] args) {
+        WeakPairMap<Object, Object, String> pm = new WeakPairMap<>();
+        Object key1 = new Object();
+        Object key2 = new Object();
+
+        // check for emptiness
+        assertEquals(pm.constainsKeyPair(key1, key2), false);
+        assertEquals(pm.get(key1, key2), null);
+
+        // check for NPE(s)
+        for (Object k1 : new Object[]{null, key1}) {
+            for (Object k2 : new Object[]{null, key2}) {
+                for (String v : new String[]{null, "abc"}) {
+
+                    if (k1 != null && k2 != null && v != null) {
+                        // skip non-null args
+                        continue;
+                    }
+
+                    try {
+                        pm.put(k1, k2, v);
+                        throw new AssertionError("Unexpected code path, k1=" +
+                                                 k1 + ", k2=" + k2 + ", v=" + v);
+                    } catch (NullPointerException e) {
+                        // expected
+                    }
+
+                    try {
+                        pm.putIfAbsent(k1, k2, v);
+                        throw new AssertionError("Unexpected code path, k1=" +
+                                                 k1 + ", k2=" + k2 + ", v=" + v);
+                    } catch (NullPointerException e) {
+                        // expected
+                    }
+
+                    if (k1 != null && k2 != null) {
+                        // skip non-null args
+                        continue;
+                    }
+
+                    try {
+                        pm.computeIfAbsent(k1, k2, (_k1, _k2) -> v);
+                        throw new AssertionError("Unexpected code path, k1=" +
+                                                 k1 + ", k2=" + k2 + ", v=" + v);
+                    } catch (NullPointerException e) {
+                        // expected
+                    }
+
+                    try {
+                        pm.constainsKeyPair(k1, k2);
+                        throw new AssertionError("Unexpected code path, k1=" +
+                                                 k1 + ", k2=" + k2);
+                    } catch (NullPointerException e) {
+                        // expected
+                    }
+
+                    try {
+                        pm.get(k1, k2);
+                        throw new AssertionError("Unexpected code path, k1=" +
+                                                 k1 + ", k2=" + k2);
+                    } catch (NullPointerException e) {
+                        // expected
+                    }
+                }
+            }
+        }
+
+        // check insertion
+        assertEquals(pm.putIfAbsent(key1, key2, "abc"), null);
+        assertEquals(pm.get(key1, key2), "abc");
+
+        // check retention while both keys are still reachable
+        gc();
+        assertEquals(pm.values().contains("abc"), true);
+        assertEquals(pm.get(key1, key2), "abc");
+
+        // check cleanup when both keys are unreachable
+        key1 = null;
+        key2 = null;
+        gc();
+        assertEquals(pm.values().contains("abc"), false);
+
+        // new insertion
+        key1 = new Object();
+        key2 = new Object();
+        assertEquals(pm.putIfAbsent(key1, key2, "abc"), null);
+        assertEquals(pm.get(key1, key2), "abc");
+
+        // check retention while both keys are still reachable
+        gc();
+        assertEquals(pm.values().contains("abc"), true);
+        assertEquals(pm.get(key1, key2), "abc");
+
+        // check cleanup when 1st key is unreachable
+        key1 = null;
+        gc();
+        assertEquals(pm.values().contains("abc"), false);
+        Reference.reachabilityFence(key2);
+
+        // new insertion
+        key1 = new Object();
+        key2 = new Object();
+        assertEquals(pm.putIfAbsent(key1, key2, "abc"), null);
+        assertEquals(pm.get(key1, key2), "abc");
+
+        // check retention while both keys are still reachable
+        gc();
+        assertEquals(pm.values().contains("abc"), true);
+        assertEquals(pm.get(key1, key2), "abc");
+
+        // check cleanup when 2nd key is unreachable
+        key2 = null;
+        gc();
+        assertEquals(pm.values().contains("abc"), false);
+        Reference.reachabilityFence(key1);
+    }
+
+    static void gc() {
+        System.gc();
+        try {
+            Thread.sleep(500L);
+        } catch (InterruptedException e) {
+            throw new AssertionError("Interrupted");
+        }
+    }
+
+    static void assertEquals(Object actual, Object expected) {
+        if (!Objects.equals(actual, expected)) {
+            throw new AssertionError("Expected: " + expected + ", actual: " + actual);
+        }
+    }
+}