1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/for-of/map-contract-expand.js b/js/src/tests/test262/language/statements/for-of/map-contract-expand.js
new file mode 100644
index 0000000000..c9cc3ed190
--- /dev/null
+++ b/js/src/tests/test262/language/statements/for-of/map-contract-expand.js
@@ -0,0 +1,39 @@
+// 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 removal and re-insertion during traversal using for..of
+info: |
+    Entries removed from a Map instance during traversal should be visited if
+    they are re-inserted prior to iterator exhaustion.
+es6id: 13.6.4
+features: [Map]
+---*/
+
+var map = new Map();
+var iterationCount = 0;
+
+var first = [0, 'a'];
+var second = [1, 'b'];
+
+map.set(0, 'a');
+map.set(1, 'b');
+
+for (var x of map) {
+  assert.sameValue(x[0], first[0]);
+  assert.sameValue(x[1], first[1]);
+
+  first = second;
+  second = null;
+
+  if (first !== null) {
+    map.delete(1);
+    map.set(1, 'b');
+  }
+
+  iterationCount += 1;
+}
+
+assert.sameValue(iterationCount, 2);
+
+reportCompare(0, 0);