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diff --git a/test/built-ins/TypedArray/prototype/copyWithin/BigInt/undefined-end.js b/test/built-ins/TypedArray/prototype/copyWithin/BigInt/undefined-end.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%.prototype.copywithin
+es6id: 22.2.3.5
+description: >
+  If `end` is undefined, set final position to `this.length`.
+info: |
+  22.2.3.5 %TypedArray%.prototype.copyWithin (target, start [ , end ] )
+
+  %TypedArray%.prototype.copyWithin is a distinct function that implements the
+  same algorithm as Array.prototype.copyWithin as defined in 22.1.3.3 except
+  that the this object's [[ArrayLength]] internal slot is accessed in place of
+  performing a [[Get]] of "length" and the actual copying of values in step 12
+  must be performed in a manner that preserves the bit-level encoding of the
+  source data.
+
+  ...
+
+  22.1.3.3 Array.prototype.copyWithin (target, start [ , end ] )
+
+  ...
+  7. If end is undefined, let relativeEnd be len; else let relativeEnd be ?
+  ToInteger(end).
+  ...
+includes: [compareArray.js, testBigIntTypedArray.js]
+---*/
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  assert(
+    compareArray(
+      new TA(convertToBigInt([0, 1, 2, 3])).copyWithin(0, 1, undefined),
+      convertToBigInt([1, 2, 3, 3])
+    ),
+    '[0, 1, 2, 3].copyWithin(0, 1, undefined) -> [1, 2, 3]'
+  );
+
+  assert(
+    compareArray(
+      new TA(convertToBigInt([0, 1, 2, 3])).copyWithin(0, 1),
+      convertToBigInt([1, 2, 3, 3])
+    ),
+    '[0, 1, 2, 3].copyWithin(0, 1) -> [1, 2, 3, 3]'
+  );
+});