1 files changed, 70 insertions, 0 deletions
diff --git a/js/src/tests/non262/Iterator/prototype/lazy-methods-proxy-accesses.js b/js/src/tests/non262/Iterator/prototype/lazy-methods-proxy-accesses.js
new file mode 100644
index 0000000000..d391a4f199
--- /dev/null
+++ b/js/src/tests/non262/Iterator/prototype/lazy-methods-proxy-accesses.js
@@ -0,0 +1,70 @@
+// |reftest| skip-if(!this.hasOwnProperty('Iterator'))
+//
+
+/*---
+esid: pending
+description: Lazy %Iterator.prototype% methods access specified properties only.
+info: >
+features: [iterator-helpers]
+---*/
+
+class TestIterator extends Iterator {
+  value = 0;
+  next() {
+    if (this.value < 2)
+      return { done: false, value: this.value++ };
+    return { done: true, value: undefined };
+  }
+}
+
+const handlerProxy = log => new Proxy({}, {
+  get: (target, key, receiver) => (...args) => {
+    const target = args[0];
+    const item = Reflect[key](...args);
+
+    log.push(`${key}: ${args.filter(x => typeof x != 'object').map(x => x.toString())}`);
+
+    return item;
+  },
+});
+
+const methods = [
+  [iter => iter.map(x => x), 'map'],
+  [iter => iter.filter(x => true), 'filter'],
+  [iter => iter.take(4), 'take'],
+  [iter => iter.drop(0), 'drop'],
+  [iter => iter.asIndexedPairs(), 'asIndexedPairs'],
+  [iter => iter.flatMap(x => [x]), 'flatMap'],
+];
+
+for (const method of methods) {
+  const log = [];
+  const iteratorProxy = new Proxy(new TestIterator(), handlerProxy(log));
+  const iteratorHelper = method[0](iteratorProxy);
+  const methodName = method[1];
+
+  iteratorHelper.next();
+  iteratorHelper.next();
+  iteratorHelper.next();
+  assertEq(iteratorHelper.next().done, true);
+
+  assertEq(
+    log.join('\n'),
+    `get: ${methodName}
+get: next
+get: value
+get: value
+getOwnPropertyDescriptor: value
+defineProperty: value
+set: value,1
+get: value
+get: value
+getOwnPropertyDescriptor: value
+defineProperty: value
+set: value,2
+get: value`
+  )
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);