1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/WeakSet/empty-iterable.js b/js/src/tests/test262/built-ins/WeakSet/empty-iterable.js
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index 0000000000..41ec8a90f7
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+++ b/js/src/tests/test262/built-ins/WeakSet/empty-iterable.js
@@ -0,0 +1,33 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-weakset-iterable
+description: >
+  If the iterable argument is empty, return new Weakset object.
+info: |
+  23.4.1.1 WeakSet ( [ iterable ] )
+
+  ...
+  9. Repeat
+    a. Let next be IteratorStep(iter).
+    b. ReturnIfAbrupt(next).
+    c. If next is false, return set.
+  ...
+---*/
+
+var counter = 0;
+var add = WeakSet.prototype.add;
+WeakSet.prototype.add = function(value) {
+  counter++;
+  return add.call(this, value);
+};
+var set = new WeakSet([]);
+
+assert.sameValue(Object.getPrototypeOf(set), WeakSet.prototype);
+assert(set instanceof WeakSet);
+assert.sameValue(
+  counter, 0,
+  'empty iterable does not call WeakSet.prototype.add'
+);
+
+reportCompare(0, 0);