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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
+description: >
+  Returns `this`.
+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 ] )
+
+  13. Return O.
+includes: [testTypedArray.js]
+features: [TypedArray]
+---*/
+
+testWithTypedArrayConstructors(function(TA) {
+  var sample1 = new TA();
+  var result1 = sample1.copyWithin(0, 0);
+
+  assert.sameValue(result1, sample1);
+
+  var sample2 = new TA([1, 2, 3]);
+  var result2 = sample2.copyWithin(1, 0);
+
+  assert.sameValue(result2, sample2);
+});
+
+reportCompare(0, 0);