1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/non262/Iterator/prototype/lazy-methods-handle-empty-iterators.js b/js/src/tests/non262/Iterator/prototype/lazy-methods-handle-empty-iterators.js
new file mode 100644
index 0000000000..e6df2758ad
--- /dev/null
+++ b/js/src/tests/non262/Iterator/prototype/lazy-methods-handle-empty-iterators.js
@@ -0,0 +1,40 @@
+// |reftest| skip-if(!this.hasOwnProperty('Iterator'))
+
+//
+//
+/*---
+esid: pending
+description: Lazy %Iterator.prototype% methods handle empty iterators.
+info: >
+  Iterator Helpers proposal 2.1.5
+features: [iterator-helpers]
+---*/
+
+class EmptyIterator extends Iterator {
+  next() { 
+    return {done: true};
+  }
+}
+
+const emptyIterator1 = new EmptyIterator();
+const emptyIterator2 = [].values();
+
+const methods = [
+  iter => iter.map(x => x),
+  iter => iter.filter(x => x),
+  iter => iter.take(1),
+  iter => iter.drop(0),
+  iter => iter.asIndexedPairs(),
+  iter => iter.flatMap(x => [x]),
+];
+
+for (const method of methods) {
+  for (const iterator of [emptyIterator1, emptyIterator2]) {
+    const result = method(iterator).next();
+    assertEq(result.done, true);
+    assertEq(result.value, undefined);
+  }
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);