1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/AsyncFromSyncIteratorPrototype/throw/throw-undefined.js b/js/src/tests/test262/built-ins/AsyncFromSyncIteratorPrototype/throw/throw-undefined.js
new file mode 100644
index 0000000000..a2f6c4c65f
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+++ b/js/src/tests/test262/built-ins/AsyncFromSyncIteratorPrototype/throw/throw-undefined.js
@@ -0,0 +1,54 @@
+// |reftest| async
+// Copyright (C) 2018 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-%asyncfromsynciteratorprototype%.throw
+description: throw() will return rejected promise if sync `throw` undefined
+info: |
+  %AsyncFromSyncIteratorPrototype%.throw ( value )
+  ...
+  2. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  ...
+  5. Let return be GetMethod(syncIterator, "throw").
+  6. IfAbruptRejectPromise(throw, promiseCapability).
+  7. If throw is undefined, then
+    a. Perform ! Call(promiseCapability.[[Reject]], undefined, « value »).
+    b. Return promiseCapability.[[Promise]].
+
+flags: [async]
+features: [async-iteration]
+---*/
+
+var obj = {
+  [Symbol.iterator]() {
+    return {
+      next() {
+        return { value: 1, done: false };
+      }
+    };
+  }
+};
+
+async function* asyncg() {
+  yield* obj;
+}
+
+var iter = asyncg();
+
+iter.next().then(function(result) {
+  iter.throw().then(
+    function (result) {
+      throw new Test262Error("Promise should be rejected, got: " + result.value);
+    },
+    function (err) {
+      assert.sameValue(err, undefined, "Promise should be rejected with undefined");
+
+      iter.next().then(({ done, value }) => {
+        assert.sameValue(done, true, 'the iterator is completed');
+        assert.sameValue(value, undefined, 'value is undefined');
+      }).then($DONE, $DONE);
+    }
+  ).catch($DONE);
+
+}).catch($DONE);