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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.reduce
+description: >
+  callbackfn `this` value
+info: |
+  22.2.3.20 %TypedArray%.prototype.reduce ( callbackfn [ , initialValue ] )
+
+  %TypedArray%.prototype.reduce is a distinct function that implements the same
+  algorithm as Array.prototype.reduce as defined in 22.1.3.19 except that the
+  this object's [[ArrayLength]] internal slot is accessed in place of performing
+  a [[Get]] of "length".
+
+  22.1.3.19 Array.prototype.reduce ( callbackfn [ , initialValue ] )
+
+  ...
+  8. Repeat, while k < len
+    ...
+    c. If kPresent is true, then
+      ...
+      i. Let accumulator be ? Call(callbackfn, undefined, « accumulator, kValue,
+      k, O »).
+  ...
+includes: [testBigIntTypedArray.js]
+features: [BigInt, TypedArray]
+---*/
+
+var expected = (function() { return this; })();
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  var sample = new TA(3);
+
+  var results = [];
+
+  sample.reduce(function() {
+    results.push(this);
+  }, 0);
+
+  assert.sameValue(results.length, 3, "results.length");
+  assert.sameValue(results[0], expected, "[0]");
+  assert.sameValue(results[1], expected, "[1]");
+  assert.sameValue(results[2], expected, "[2]");
+});