1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Iterator/prototype/flatMap/flattens-iterable.js b/js/src/tests/test262/built-ins/Iterator/prototype/flatMap/flattens-iterable.js
new file mode 100644
index 0000000000..90a1f9bb5e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Iterator/prototype/flatMap/flattens-iterable.js
@@ -0,0 +1,33 @@
+// |reftest| shell-option(--enable-iterator-helpers) skip-if(!this.hasOwnProperty('Iterator')||!xulRuntime.shell) -- iterator-helpers is not enabled unconditionally, requires shell-options
+// Copyright (C) 2023 Michael Ficarra. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-iteratorprototype.flatMap
+description: >
+  Iterator.prototype.flatMap flattens iterables returned by the mapper
+info: |
+  %Iterator.prototype%.flatMap ( mapper )
+
+includes: [compareArray.js]
+features: [iterator-helpers]
+flags: []
+---*/
+
+function* g() {
+  yield 0;
+  yield 1;
+  yield 2;
+  yield 3;
+}
+
+let iter = g().flatMap((v, count) => {
+  let result = [];
+  for (let i = 0; i < v; ++i) {
+    result.push(v);
+  }
+  return result;
+});
+
+assert.compareArray(Array.from(iter), [1, 2, 2, 3, 3, 3]);
+
+reportCompare(0, 0);