1 files changed, 68 insertions, 0 deletions
diff --git a/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-proxy-accesses.js b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-proxy-accesses.js
new file mode 100644
index 0000000000..5892a41e5b
--- /dev/null
+++ b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-proxy-accesses.js
@@ -0,0 +1,68 @@
+// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator'))
+//
+
+/*---
+esid: pending
+description: Lazy %AsyncIterator.prototype% methods access specified properties only.
+info: >
+  Iterator Helpers proposal 2.1.6
+features: [iterator-helpers]
+---*/
+
+let log;
+const handlerProxy = new Proxy({}, {
+  get: (target, key, receiver) => (...args) => {
+    log.push(`${key}: ${args.filter(x => typeof x != 'object').map(x => x.toString())}`);
+    return Reflect[key](...args);
+  },
+});
+
+class TestIterator extends AsyncIterator {
+  value = 0;
+  async next() {
+    if (this.value < 1)
+      return new Proxy({done: false, value: this.value++}, handlerProxy);
+    return new Proxy({done: true, value: undefined}, handlerProxy);
+  }
+}
+
+const methods = [
+  ['map', x => x],
+  ['filter', x => true],
+  ['take', 4],
+  ['drop', 0],
+  ['asIndexedPairs', undefined],
+  ['flatMap', async function*(x) { yield x; }],
+];
+
+(async () => {
+  for (const [method, argument] of methods) {
+    log = [];
+    const iteratorProxy = new Proxy(new TestIterator(), handlerProxy);
+    const iteratorHelper = iteratorProxy[method](argument);
+
+    await iteratorHelper.next();
+    await iteratorHelper.next();
+    const {done} = await iteratorHelper.next();
+    assertEq(done, true);
+    assertEq(
+      log.join('\n'),
+      `get: ${method}
+get: next
+get: value
+get: value
+set: value,1
+getOwnPropertyDescriptor: value
+defineProperty: value
+get: then
+get: done
+get: value
+get: value
+get: then
+get: done`
+    );
+  }
+})();
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);