1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/subclass/builtin-objects/Set/regular-subclassing.js b/js/src/tests/test262/language/statements/class/subclass/builtin-objects/Set/regular-subclassing.js
new file mode 100644
index 0000000000..43a92d8a69
--- /dev/null
+++ b/js/src/tests/test262/language/statements/class/subclass/builtin-objects/Set/regular-subclassing.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 23.2.1
+description: Subclassing the Set object
+info: |
+  23.2.1 The Set Constructor
+
+  ...
+
+  The Set 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 Set behaviour must include a super call to the
+  Set constructor to create and initialize the subclass instance with the
+  internal state necessary to support the Set.prototype built-in methods.
+---*/
+
+class S extends Set {}
+
+var set = new S([{}, {}]);
+
+assert.sameValue(set.size, 2);
+
+set.add({});
+
+assert.sameValue(set.size, 3);
+
+reportCompare(0, 0);