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diff --git a/js/src/tests/test262/built-ins/Atomics/waitAsync/value-not-equal.js b/js/src/tests/test262/built-ins/Atomics/waitAsync/value-not-equal.js
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+++ b/js/src/tests/test262/built-ins/Atomics/waitAsync/value-not-equal.js
@@ -0,0 +1,50 @@
+// |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: >
+  Returns "not-equal" when value arg does not match an index in the typedArray
+info: |
+  Atomics.waitAsync( typedArray, index, value, timeout )
+
+  1. Return DoWait(async, typedArray, index, value, timeout).
+
+  DoWait ( mode, typedArray, index, value, timeout )
+
+  16. Let w be ! AtomicLoad(typedArray, i).
+  17. If v is not equal to w, then
+    a. Perform LeaveCriticalSection(WL).
+    b. If mode is sync, then
+      i. Return the String "not-equal".
+    c. Perform ! Call(capability.[[Resolve]], undefined, « "not-equal" »).
+    d. Return promiseCapability.[[Promise]].
+
+flags: [async]
+features: [Atomics.waitAsync, SharedArrayBuffer, TypedArray, computed-property-names, Symbol, Symbol.toPrimitive, 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 * 4)
+);
+
+const valueOf = {
+  valueOf() {
+    return undefined;
+  }
+};
+
+const toPrimitive = {
+  [Symbol.toPrimitive]() {
+    return undefined;
+  }
+};
+
+Promise.all([
+    Atomics.store(i32a, 0, 42),
+    Atomics.waitAsync(i32a, 0, 0).value,
+  ]).then(outcomes => {
+    assert.sameValue(outcomes[0], 42, 'The value of outcomes[0] is 42');
+    assert.sameValue(outcomes[1], 'not-equal', 'The value of outcomes[1] is "not-equal"');
+  }).then($DONE, $DONE);