1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/MapIteratorPrototype/next/iteration-mutable.js b/js/src/tests/test262/built-ins/MapIteratorPrototype/next/iteration-mutable.js
new file mode 100644
index 0000000000..bbb332bdd2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/MapIteratorPrototype/next/iteration-mutable.js
@@ -0,0 +1,54 @@
+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 23.1.3.12
+description: >
+  When an item is added to the map after the iterator is created but before
+  the iterator is "done" (as defined by 23.1.5.2.1), the new item should be
+  accessible via iteration. When an item is added to the map after the
+  iterator is "done", the new item should not be accessible via iteration.
+features: [Symbol.iterator]
+---*/
+
+var map = new Map();
+map.set(1, 11);
+map.set(2, 22);
+
+var iterator = map[Symbol.iterator]();
+var result;
+
+result = iterator.next();
+assert.sameValue(result.value[0], 1, 'First result `value` (map key)');
+assert.sameValue(result.value[1], 11, 'First result `value` (map value)');
+assert.sameValue(result.value.length, 2, 'First result `value` (length)');
+assert.sameValue(result.done, false, 'First result `done` flag');
+
+map.set(3, 33);
+
+result = iterator.next();
+assert.sameValue(result.value[0], 2, 'Second result `value` (map key)');
+assert.sameValue(result.value[1], 22, 'Second result `value` (map value)');
+assert.sameValue(result.value.length, 2, 'Second result `value` (length)');
+assert.sameValue(result.done, false, 'Second result `done` flag');
+
+result = iterator.next();
+assert.sameValue(result.value[0], 3, 'Third result `value` (map key)');
+assert.sameValue(result.value[1], 33, 'Third result `value` (map value)');
+assert.sameValue(result.value.length, 2, 'Third result `value` (length)');
+assert.sameValue(result.done, false, 'Third result `done` flag');
+
+result = iterator.next();
+assert.sameValue(result.value, undefined, 'Exhausted result `value`');
+assert.sameValue(result.done, true, 'Exhausted result `done` flag');
+
+map.set(4, 44);
+
+result = iterator.next();
+assert.sameValue(
+  result.value, undefined, 'Exhausted result `value` (repeated request)'
+);
+assert.sameValue(
+  result.done, true, 'Exhausted result `done` flag (repeated request)'
+);
+
+reportCompare(0, 0);