1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/for-of/map-expand-contract.js b/js/src/tests/test262/language/statements/for-of/map-expand-contract.js
new file mode 100644
index 0000000000..cd1c2ed6dc
--- /dev/null
+++ b/js/src/tests/test262/language/statements/for-of/map-expand-contract.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Map entry insertion during traversal using for..of
+info: |
+    New entries inserted into a Map instance during traversal should not be
+    visited if they are removed prior to visitation.
+es6id: 13.6.4
+features: [Map]
+---*/
+
+var map = new Map();
+var iterationCount = 0;
+
+map.set(0, 'a');
+
+for (var x of map) {
+  assert.sameValue(x[0], 0);
+  assert.sameValue(x[1], 'a');
+
+  map.set(1, 'b');
+  map.delete(1);
+
+  iterationCount += 1;
+}
+
+assert.sameValue(iterationCount, 1);
+
+reportCompare(0, 0);