1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/tests/non262/Iterator/prototype/lazy-methods-pass-value-through-chain.js b/js/src/tests/non262/Iterator/prototype/lazy-methods-pass-value-through-chain.js
new file mode 100644
index 0000000000..553e6934f7
--- /dev/null
+++ b/js/src/tests/non262/Iterator/prototype/lazy-methods-pass-value-through-chain.js
@@ -0,0 +1,33 @@
+// |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 outerMethod of methods) {
+  for (const innerMethod of methods) {
+    const iterator = new TestIterator();
+    const iteratorChain = outerMethod(innerMethod(iterator));
+    iteratorChain.next();
+    let result = iteratorChain.next('last value');
+    assertEq(result.done, false);
+    // Unwrap the asIndexedPair return values.
+    while (Array.isArray(result.value)) {
+      result.value = result.value[1];
+    }
+    assertEq(result.value, 'last value');
+  }
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);