diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_5/extensions/weakmap.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_5/extensions/weakmap.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,107 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor:
+ *   Andreas Gal <gal@mozilla.com>
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 547941;
+var summary = 'js weak maps';
+var actual = '';
+var expect = '';
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+    enterFunc ('test');
+    printBugNumber(BUGNUMBER);
+    printStatus(summary);
+
+    var TestPassCount = 0;
+    var TestFailCount = 0;
+    var TestTodoCount = 0;
+
+    var TODO = 1;
+
+    function check(fun, todo) {
+        var thrown = null;
+        var success = false;
+        try {
+            success = fun();
+        } catch (x) {
+            thrown = x;
+        }
+
+        if (thrown)
+            success = false;
+
+        if (todo) {
+            TestTodoCount++;
+
+            if (success) {
+                var ex = new Error;
+                print ("=== TODO but PASSED? ===");
+                print (ex.stack);
+                print ("========================");
+            }
+
+            return;
+        }
+
+        if (success) {
+            TestPassCount++;
+        } else {
+            TestFailCount++;
+
+            var ex = new Error;
+            print ("=== FAILED ===");
+            print (ex.stack);
+            if (thrown) {
+                print ("    threw exception:");
+                print (thrown);
+            }
+            print ("==============");
+        }
+    }
+
+    function checkThrows(fun, todo) {
+        let thrown = false;
+        try {
+            fun();
+        } catch (x) {
+            thrown = true;
+        }
+
+        check(function() thrown, todo);
+    }
+
+    var key = {};
+    var map = WeakMap();
+
+    check(function() !map.has(key));
+    map.set(key, 42);
+    check(function() map.get(key) == 42);
+    check(function() typeof map.get({}) == "undefined");
+    check(function() map.get({}, "foo") == "foo");
+
+    gc(); gc(); gc();
+
+    check(function() map.get(key) == 42);
+    map.delete(key);
+    check(function() typeof map.get(key) == "undefined");
+    check(function() !map.has(key));
+
+    var value = { };
+    map.set(new Object(), value);
+    gc(); gc(); gc();
+
+    print ("done");
+
+    reportCompare(0, TestFailCount, "weak map tests");
+
+    exitFunc ('test');
+}