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diff --git a/js/src/tests/test262/built-ins/Atomics/isLockFree/bigint/expected-return-value.js b/js/src/tests/test262/built-ins/Atomics/isLockFree/bigint/expected-return-value.js
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+++ b/js/src/tests/test262/built-ins/Atomics/isLockFree/bigint/expected-return-value.js
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+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2018 Rick Waldron.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.isLockFree
+description: >
+  Atomics.isLockFree returns a boolean that indicates whether
+  operations on datum of size will be performed without the agent
+  acquiring a lock outside of size bytes.
+info: |
+  Atomics.isLockFree( size )
+
+  1. Let n be ? ToInteger(size).
+  2. Let AR be the Agent Record of the surrounding agent.
+  3. If n equals 1, return AR.[[IsLockFree1]].
+  4. If n equals 2, return AR.[[IsLockFree2]].
+  5. If n equals 4, return true.
+  6. If n equals 8, return AR.[[IsLockFree8]].
+  7. Return false.
+
+features: [Atomics, BigInt, SharedArrayBuffer, TypedArray]
+includes: [testBigIntTypedArray.js]
+---*/
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  var observed = Atomics.isLockFree(TA.BYTES_PER_ELEMENT);
+
+  assert.sameValue(
+    Atomics.isLockFree(TA.BYTES_PER_ELEMENT),
+    observed,
+    'Atomics.isLockFree(TA.BYTES_PER_ELEMENT) returns the value of `observed` (Atomics.isLockFree(TA.BYTES_PER_ELEMENT))'
+  );
+});
+
+
+
+reportCompare(0, 0);