1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/fromAsync/mapfn-sync-iterable-async.js b/js/src/tests/test262/built-ins/Array/fromAsync/mapfn-sync-iterable-async.js
new file mode 100644
index 0000000000..20a22b13b2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/fromAsync/mapfn-sync-iterable-async.js
@@ -0,0 +1,34 @@
+// |reftest| shell-option(--enable-array-from-async) skip-if(!Array.fromAsync||!xulRuntime.shell) async -- Array.fromAsync is not enabled unconditionally, requires shell-options
+// 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: >
+  A synchronous mapping function is applied to each item yielded by an
+  asynchronous iterable.
+info: |
+  3.j.ii.6. If _mapping_ is *true*, then
+    a. Let _mappedValue_ be Call(_mapfn_, _thisArg_, « _nextValue_, 𝔽(_k_) »).
+    ...
+  ...
+  8. Let _defineStatus_ be CreateDataPropertyOrThrow(_A_, _Pk_, _mappedValue_).
+flags: [async]
+includes: [asyncHelpers.js, compareArray.js]
+features: [Array.fromAsync]
+---*/
+
+async function* asyncGen() {
+  for (let i = 0; i < 4; i++) {
+    yield Promise.resolve(i * 2);
+  }
+}
+
+function syncMap(val, ix) {
+  return val * ix;
+}
+
+asyncTest(async () => {
+  const result = await Array.fromAsync({ [Symbol.asyncIterator]: asyncGen }, syncMap);
+  assert.compareArray(result, [0, 2, 8, 18], "sync mapfn should be applied to async iterable");
+});