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diff --git a/test/built-ins/TypedArrays/ctors-bigint/buffer-arg/new-instance-extensibility.js b/test/built-ins/TypedArrays/ctors-bigint/buffer-arg/new-instance-extensibility.js
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+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-typedarray-buffer-byteoffset-length
+description: >
+  The new typedArray instance from a buffer argument is extensible
+info: |
+  22.2.4.5 TypedArray ( buffer [ , byteOffset [ , length ] ] )
+
+  ...
+  4. Let O be ? AllocateTypedArray(constructorName, NewTarget,
+  "%TypedArrayPrototype%").
+  ...
+
+  22.2.4.2.1 Runtime Semantics: AllocateTypedArray (constructorName, newTarget,
+  defaultProto [ , length ])
+
+  ...
+  2. Let obj be IntegerIndexedObjectCreate(proto, « [[ViewedArrayBuffer]],
+  [[TypedArrayName]], [[ByteLength]], [[ByteOffset]], [[ArrayLength]] »).
+  ...
+
+  9.4.5.7 IntegerIndexedObjectCreate (prototype, internalSlotsList)
+
+  ...
+  11. Set the [[Extensible]] internal slot of A to true.
+  ...
+includes: [testBigIntTypedArray.js]
+features: [BigInt, TypedArray]
+---*/
+
+testWithTypedArrayConstructors(function(TA) {
+  var buffer = new ArrayBuffer(8);
+  var sample = new TA(buffer);
+
+  assert(Object.isExtensible(sample));
+});