1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-pass-through-lastValue.js b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-pass-through-lastValue.js
new file mode 100644
index 0000000000..40da229ca6
--- /dev/null
+++ b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-pass-through-lastValue.js
@@ -0,0 +1,33 @@
+// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator'))
+
+class TestAsyncIterator extends AsyncIterator {
+  async next(value) { 
+    return {done: false, value};
+  }
+}
+
+const methods = [
+  iter => iter.map(x => x),
+  iter => iter.filter(x => true),
+  iter => iter.take(2),
+  iter => iter.drop(0),
+  iter => iter.asIndexedPairs(),
+];
+
+for (const method of methods) {
+  const iterator = new TestAsyncIterator();
+  const iteratorHelper = method(iterator);
+  iteratorHelper.next().then(
+    _ => iteratorHelper.next('last value').then(
+      ({done, value}) => {
+        assertEq(done, false);
+        // Unwrap the return value from asIndexedPairs.
+        assertEq(Array.isArray(value) ? value[1] : value, 'last value');
+      }
+    ),
+  );
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);
+