1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/yield/iter-value-specified.js b/js/src/tests/test262/language/expressions/yield/iter-value-specified.js
new file mode 100644
index 0000000000..cd5355f6d0
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/yield/iter-value-specified.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 25.2
+description: >
+    When the `next` method of a generator-produced iterable is invoked without
+    an argument, the corresponding `yield` expression should be evaluated as
+    `undefined`.
+features: [generators]
+---*/
+
+function* g() { actual = yield; }
+var expected = {};
+var iter = g();
+var actual, result;
+
+result = iter.next();
+assert.sameValue(result.value, undefined, 'First result `value`');
+assert.sameValue(result.done, false, 'First result `done` flag');
+assert.sameValue(
+  actual, undefined, 'Value of `yield` expression (prior to continuation)'
+);
+
+result = iter.next(expected);
+assert.sameValue(result.value, undefined, 'Second result `value`');
+assert.sameValue(result.done, true, 'Second result `done` flag');
+assert.sameValue(
+  actual, expected, 'Value of `yield` expression (following continuation)'
+);
+
+reportCompare(0, 0);