1 files changed, 64 insertions, 0 deletions
diff --git a/js/src/tests/non262/Iterator/prototype/flatMap/throw-when-inner-not-iterable.js b/js/src/tests/non262/Iterator/prototype/flatMap/throw-when-inner-not-iterable.js
new file mode 100644
index 0000000000..eb581936e1
--- /dev/null
+++ b/js/src/tests/non262/Iterator/prototype/flatMap/throw-when-inner-not-iterable.js
@@ -0,0 +1,64 @@
+// |reftest| skip-if(!this.hasOwnProperty('Iterator'))
+
+//
+//
+/*---
+esid: pending
+description: %Iterator.prototype%.flatMap closes the iterator and throws when mapped isn't iterable.
+info: >
+  Iterator Helpers proposal 2.1.5.7
+  1. Repeat,
+    ...
+    f. Let innerIterator be GetIterator(mapped, sync).
+    g. IfAbruptCloseIterator(innerIterator, iterated).
+features: [iterator-helpers]
+---*/
+
+class NotIterable {
+  next() {
+    return {done: true};
+  }
+}
+
+class InvalidIterable {
+  [Symbol.iterator]() {
+    return {};
+  }
+}
+
+class TestIterator extends Iterator {
+  next() {
+    return {done: false, value: 0};
+  }
+
+  closed = false;
+  return() {
+    this.closed = true;
+    return {done: true};
+  }
+}
+
+const nonIterables = [
+  new NotIterable(),
+  new InvalidIterable(),
+  undefined,
+  null,
+  0,
+  false,
+  Symbol(''),
+  0n,
+  {},
+];
+
+for (const value of nonIterables) {
+  const iter = new TestIterator();
+  const mapped = iter.flatMap(x => value);
+
+  assertEq(iter.closed, false);
+  assertThrowsInstanceOf(() => mapped.next(), TypeError);
+  assertEq(iter.closed, true);
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);
+