1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/subclass/builtin-objects/WeakMap/regular-subclassing.js b/js/src/tests/test262/language/statements/class/subclass/builtin-objects/WeakMap/regular-subclassing.js
new file mode 100644
index 0000000000..04e2258258
--- /dev/null
+++ b/js/src/tests/test262/language/statements/class/subclass/builtin-objects/WeakMap/regular-subclassing.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 23.3.1
+description: Subclassing the WeakMap object
+info: |
+  23.3.1 The WeakMap Constructor
+
+  ...
+
+  The WeakMap constructor is designed to be subclassable. It may be used as the
+  value in an extends clause of a class definition. Subclass constructors that
+  intend to inherit the specified WeakMap behaviour must include a super call to
+  the WeakMap constructor to create and initialize the subclass instance with
+  the internal state necessary to support the WeakMap.prototype built-in
+  methods.
+features: [WeakMap]
+---*/
+
+class WM extends WeakMap {}
+
+var map = new WM();
+var obj = {};
+
+assert.sameValue(map.has(obj), false);
+
+map.set(obj, 42);
+assert.sameValue(map.has(obj), true);
+assert.sameValue(map.get(obj), 42);
+
+reportCompare(0, 0);