1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Set/prototype/forEach/iterates-values-deleted-then-readded.js b/js/src/tests/test262/built-ins/Set/prototype/forEach/iterates-values-deleted-then-readded.js
new file mode 100644
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--- /dev/null
+++ b/js/src/tests/test262/built-ins/Set/prototype/forEach/iterates-values-deleted-then-readded.js
@@ -0,0 +1,47 @@
+// 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-set.prototype.forEach
+description: >
+    Set.prototype.forEach ( callbackfn [ , thisArg ] )
+
+    ...
+    7. Repeat for each e that is an element of entries, in original insertion order
+      a. If e is not empty, then
+        i. Let funcResult be Call(callbackfn, T, «e, e, S»).
+        ii. ReturnIfAbrupt(funcResult).
+    ...
+
+    NOTE:
+
+    ...
+    Values that are deleted after the call to forEach begins and before being visited are not visited unless the value is added again before the forEach call completes.
+    ...
+
+---*/
+
+
+var s = new Set([1, 2, 3]);
+var expects = [1, 3, 2];
+
+s.forEach(function(value, entry, set) {
+  var expect = expects.shift();
+
+  // Delete `2` before being visited
+  if (value === 1) {
+    set.delete(2);
+  }
+
+  // Re-add `2` before forEach call completes
+  if (value === 3) {
+    set.add(2);
+  }
+
+  assert.sameValue(value, expect);
+  assert.sameValue(entry, expect);
+  assert.sameValue(set, s);
+});
+
+assert.sameValue(expects.length, 0, "The value of `expects.length` is `0`");
+
+reportCompare(0, 0);