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diff --git a/js/src/tests/test262/built-ins/AsyncFromSyncIteratorPrototype/throw/iterator-result.js b/js/src/tests/test262/built-ins/AsyncFromSyncIteratorPrototype/throw/iterator-result.js
new file mode 100644
index 0000000000..90b02da8c2
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+++ b/js/src/tests/test262/built-ins/AsyncFromSyncIteratorPrototype/throw/iterator-result.js
@@ -0,0 +1,60 @@
+// |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 call default sync throw
+info: |
+  %AsyncFromSyncIteratorPrototype%.throw ( value )
+  ...
+  2. Let promiseCapability be ! NewPromiseCapability(%Promise%).
+  ...
+  5. Let throw be GetMethod(syncIterator, "throw").
+  ...
+  8. Let throwResult be Call(throw, syncIterator, « value »)
+  9. IfAbruptRejectPromise(throwResult, promiseCapability).
+  ...
+  22. Return promiseCapability.[[Promise]].
+
+  Generator.prototype.throw ( exception )
+  1. Let g be the this value.
+  2. Let C be Completion{[[Type]]: throw, [[Value]]: exception, [[Target]]: empty}.
+  3. Return ? GeneratorResumeAbrupt(g, C).
+
+flags: [async]
+features: [async-iteration]
+---*/
+
+var thrownError = new Error("Catch me.")
+
+function* g() {
+  yield 42;
+  throw new Test262Error('throw closes iter');
+  yield 43;
+}
+
+async function* asyncg() {
+  yield* g();
+}
+
+var iter = asyncg();
+
+iter.next().then(function(result) {
+
+  // throw will call sync generator prototype built-in function throw
+  iter.throw(thrownError).then(
+    function(result) {
+      throw new Test262Error('throw should cause rejection of promise');
+    },
+    function(err) {
+      assert.sameValue(err, thrownError, "promise should be reject with custom error, got: " + err)
+
+      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);