1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Iterator/prototype/flatMap/iterable-primitives-are-not-flattened.js b/js/src/tests/test262/built-ins/Iterator/prototype/flatMap/iterable-primitives-are-not-flattened.js
new file mode 100644
index 0000000000..96c62357ae
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Iterator/prototype/flatMap/iterable-primitives-are-not-flattened.js
@@ -0,0 +1,40 @@
+// |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 does not respect the iterability of any primitive
+info: |
+  %Iterator.prototype%.flatMap ( mapper )
+
+  5.b.vi. Let innerIterator be Completion(GetIteratorFlattenable(mapped)).
+
+includes: [compareArray.js]
+features: [iterator-helpers]
+flags: []
+---*/
+
+function* g() {
+  yield 0;
+}
+
+Number.prototype[Symbol.iterator] = function* () {
+  let i = 0;
+  let target = this >>> 0;
+  while (i < target) {
+    yield i;
+    ++i;
+  }
+};
+
+assert.compareArray(Array.from(5), [0, 1, 2, 3, 4]);
+
+assert.throws(TypeError, function () {
+  for (let unused of g().flatMap(v => 5));
+});
+
+let iter = g().flatMap(v => new Number(5));
+assert.compareArray(Array.from(iter), [0, 1, 2, 3, 4]);
+
+reportCompare(0, 0);