1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-return-new-iterator-result.js b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-return-new-iterator-result.js
new file mode 100644
index 0000000000..02cae2740d
--- /dev/null
+++ b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-return-new-iterator-result.js
@@ -0,0 +1,42 @@
+// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator'))
+
+//
+//
+/*---
+esid: pending
+description: Lazy Iterator Helper methods return new iterator result objects.
+info: >
+  Iterator Helpers proposal 2.1.6
+features: [iterator-helpers]
+---*/
+
+const iterResult = {done: false, value: 1, testProperty: 'test'};
+class TestIterator extends AsyncIterator {
+  async next() {
+    return iterResult;
+  }
+}
+
+async function* gen(x) { yield x; }
+
+const methods = [
+  iter => iter.map(x => x),
+  iter => iter.filter(x => true),
+  iter => iter.take(1),
+  iter => iter.drop(0),
+  iter => iter.asIndexedPairs(),
+  iter => iter.flatMap(gen),
+];
+
+// Call `return` before stepping the iterator:
+for (const method of methods) {
+  const iter = new TestIterator();
+  const iterHelper = method(iter);
+  iterHelper.next().then(result => {
+    assertEq(result == iterResult, false);
+    assertEq(result.testProperty, undefined);
+  });
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);