JSTests/test262/test/built-ins/TypedArray/prototype/fill/BigInt/fill-values.js

// 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.fill
description: >
  Fills all the elements with `value` from a default start and index.
info: |
  22.2.3.8 %TypedArray%.prototype.fill (value [ , start [ , end ] ] )

  %TypedArray%.prototype.fill is a distinct function that implements the same
  algorithm as Array.prototype.fill as defined in 22.1.3.6 except that the this
  object's [[ArrayLength]] internal slot is accessed in place of performing a
  [[Get]] of "length". The implementation of the algorithm may be optimized with
  the knowledge that the this value is an object that has a fixed length and
  whose integer indexed properties are not sparse. However, such optimization
  must not introduce any observable changes in the specified behaviour of the
  algorithm.

  ...

  22.1.3.6 Array.prototype.fill (value [ , start [ , end ] ] )

  ...
  7. Repeat, while k < final
    a. Let Pk be ! ToString(k).
    b. Perform ? Set(O, Pk, value, true).
includes: [compareArray.js, testBigIntTypedArray.js]
features: [BigInt, TypedArray]
---*/

testWithBigIntTypedArrayConstructors(function(TA) {
  assert(
    compareArray(
      new TA().fill(8n),
      []
    ),
    "does not fill an empty instance"
  );

  assert(
    compareArray(new TA([0n, 0n, 0n]).fill(8n), [8n, 8n, 8n]),
    "Default start and end indexes are 0 and this.length"
  );
});