1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/fromAsync/non-iterable-input-does-not-use-array-prototype.js b/js/src/tests/test262/built-ins/Array/fromAsync/non-iterable-input-does-not-use-array-prototype.js
new file mode 100644
index 0000000000..ba639aae1b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/fromAsync/non-iterable-input-does-not-use-array-prototype.js
@@ -0,0 +1,47 @@
+// |reftest| async
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.fromasync
+description: Non-iterable input does not use Array.prototype
+includes: [compareArray.js, asyncHelpers.js]
+flags: [async]
+features: [Array.fromAsync]
+---*/
+
+asyncTest(async function () {
+const arrayIterator = [].values();
+const IntrinsicArrayIteratorPrototype =
+Object.getPrototypeOf(arrayIterator);
+const intrinsicArrayIteratorPrototypeNext =
+IntrinsicArrayIteratorPrototype.next;
+
+try {
+// Temporarily mutate the array iterator prototype to have an invalid
+// “next” method. Just like Array.from, the fromAsync function should
+// still work on non-iterable arraylike arguments.
+IntrinsicArrayIteratorPrototype.next = function fakeNext () {
+  throw new Test262Error(
+    'This fake next function should not be called; ' +
+    'instead, each element should have been directly accessed.',
+  );
+};
+
+const expected = [ 0, 1, 2 ];
+const input = {
+  length: 3,
+  0: 0,
+  1: 1,
+  2: 2,
+};
+const output = await Array.fromAsync(input);
+assert.compareArray(output, expected);
+}
+
+finally {
+// Reset the intrinsic array iterator
+IntrinsicArrayIteratorPrototype.next =
+  intrinsicArrayIteratorPrototypeNext;
+}
+});