1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-pass-value-through-chain.js b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-pass-value-through-chain.js
new file mode 100644
index 0000000000..8b5506ee97
--- /dev/null
+++ b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-pass-value-through-chain.js
@@ -0,0 +1,38 @@
+// |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 outerMethod of methods) {
+  for (const innerMethod of methods) {
+    const iterator = new TestAsyncIterator();
+    const iteratorChain = outerMethod(innerMethod(iterator));
+    iteratorChain.next().then(
+      _ => iteratorChain.next('last value').then(
+        ({done, value}) => {
+          assertEq(done, false);
+          // Unwrap the asIndexedPair return values.
+          while (Array.isArray(value)) {
+            value = value[1];
+          }
+          assertEq(value, 'last value');
+        }
+      ),
+    );
+  }
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);
+