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diff --git a/js/src/tests/test262/built-ins/Atomics/waitAsync/returns-result-object-value-is-promise-resolves-to-timed-out.js b/js/src/tests/test262/built-ins/Atomics/waitAsync/returns-result-object-value-is-promise-resolves-to-timed-out.js
new file mode 100644
index 0000000000..9cd01f3200
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+++ b/js/src/tests/test262/built-ins/Atomics/waitAsync/returns-result-object-value-is-promise-resolves-to-timed-out.js
@@ -0,0 +1,57 @@
+// |reftest| skip async -- Atomics.waitAsync is not supported
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.waitasync
+description: >
+  Atomics.waitAsync returns a result object containing a promise that resolves to "timed-out" and async is true.
+info: |
+  Atomics.waitAsync( typedArray, index, value, timeout )
+
+  1. Return DoWait(async, typedArray, index, value, timeout).
+
+  DoWait ( mode, typedArray, index, value, timeout )
+
+  ...
+  13. Let promiseCapability be undefined.
+  14. If mode is async, then
+    a. Set promiseCapability to ! NewPromiseCapability(%Promise%).
+
+  ...
+  Perform ! CreateDataPropertyOrThrow(_resultObject_, *"async"*, *true*).
+  Perform ! CreateDataPropertyOrThrow(_resultObject_, *"value"*, _promiseCapability_.[[Promise]]).
+  Return _resultObject_.
+
+flags: [async]
+includes: [atomicsHelper.js]
+features: [Atomics.waitAsync, TypedArray, SharedArrayBuffer, destructuring-binding, Atomics, arrow-function]
+---*/
+assert.sameValue(typeof Atomics.waitAsync, 'function', 'The value of `typeof Atomics.waitAsync` is "function"');
+
+const i32a = new Int32Array(
+  new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 8)
+);
+
+let {async, value} = Atomics.waitAsync(i32a, 0, 0, 1);
+let outcome = null;
+let lifespan = 1000;
+let start = $262.agent.monotonicNow();
+
+function wait() {
+  let elapsed = $262.agent.monotonicNow() - start;
+  if (elapsed > lifespan) {
+    $DONE("Test timed out");
+    return;
+  }
+  if (outcome === "timed-out") {
+    $DONE();
+    return;
+  }
+
+  $262.agent.setTimeout(wait, 0);
+}
+
+wait();
+
+value.then(result => (outcome = result), $DONE);