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diff --git a/js/src/tests/test262/harness/asyncHelpers-throwsAsync-custom.js b/js/src/tests/test262/harness/asyncHelpers-throwsAsync-custom.js
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index 0000000000..44614a4f7f
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+++ b/js/src/tests/test262/harness/asyncHelpers-throwsAsync-custom.js
@@ -0,0 +1,20 @@
+// |reftest| async
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: |
+    Thenables that reject with values of the specified constructor function
+    satisfy the assertion.
+flags: [async]
+includes: [asyncHelpers.js]
+---*/
+
+function MyError() {}
+
+asyncTest(async function () {
+  const p = assert.throwsAsync(MyError, function () {
+    return Promise.reject(new MyError());
+  });
+  assert(p instanceof Promise);
+  await p;
+});