1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/tests/non262/Iterator/prototype/lazy-methods-pass-through-lastValue.js b/js/src/tests/non262/Iterator/prototype/lazy-methods-pass-through-lastValue.js
new file mode 100644
index 0000000000..a7195b38e4
--- /dev/null
+++ b/js/src/tests/non262/Iterator/prototype/lazy-methods-pass-through-lastValue.js
@@ -0,0 +1,29 @@
+// |reftest| skip-if(!this.hasOwnProperty('Iterator'))
+
+class TestIterator extends Iterator {
+  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 TestIterator();
+  const iteratorHelper = method(iterator);
+  iteratorHelper.next();
+  let result = iteratorHelper.next('last value');
+  assertEq(result.done, false);
+  // Array.isArray is used to make sure we unwrap asIndexedPairs results.
+  assertEq(Array.isArray(result.value) ? result.value[1] : result.value, 'last value');
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);
+