test WeakReference

native.js

@@ -40,7 +40,7 @@ function setNative(javaObj, nativeObj) {
 }
 
 function deleteNative(javaObj) {
-    NativeMap.delete(javaObj);
+    NativeMap.delete(javaObj._address);
 }
 
 Native["java/lang/System.arraycopy.(Ljava/lang/Object;ILjava/lang/Object;II)V"] = function(src, srcOffset, dst, dstOffset, length) {

tests/java/lang/ref/TestWeakReference.java

@@ -0,0 +1,18 @@
+package java.lang.ref;
+
+import gnu.testlet.Testlet;
+import gnu.testlet.TestHarness;
+
+public class TestWeakReference implements Testlet {
+  public int getExpectedPass() { return 2; }
+  public int getExpectedFail() { return 0; }
+  public int getExpectedKnownFail() { return 0; }
+
+  public void test(TestHarness th) {
+    Object obj = new Object();
+    WeakReference weakRef = new WeakReference(obj);
+    th.check(weakRef.get(), obj, "weakly held referent is object");
+    weakRef.clear();
+    th.check(weakRef.get(), null, "cleared weakly held referent is null");
+  }
+}