JSTests/test262/test/intl402/DateTimeFormat/constructor-options-fractionalSecondDigits-valid.js

// Copyright 2019 Google Inc. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-initializedatetimeformat
description: >
    Checks handling of the options argument to the DateTimeFormat constructor.
info: |
    InitializeDateTimeFormat ( dateTimeFormat, locales, options )
    23. Let _opt_.[[FractionalSecondDigits]] be ? GetNumberOption(_options_, `"fractionalSecondDigits"`, 0, 3, 0).
features: [Intl.DateTimeFormat-fractionalSecondDigits]
---*/


const validOptions = [
  [undefined, 0],
  [-0, 0],
  [0, 0],
  ["0", 0],
  [1, 1],
  ["1", 1],
  [2, 2],
  ["2", 2],
  [3, 3],
  ["3", 3],
  [2.9, 2],
  ["2.9", 2],
  [0.00001, 0],
  [{ toString() { return "3"; } }, 3],
  [{ valueOf() { return -0; }, toString: undefined }, 0],
];
for (const [fractionalSecondDigits, expected] of validOptions) {
  const dtf = new Intl.DateTimeFormat("en", { fractionalSecondDigits });
  const options = dtf.resolvedOptions();
  assert.sameValue(options.fractionalSecondDigits, expected);
  const propdesc = Object.getOwnPropertyDescriptor(options, "fractionalSecondDigits");
  if (expected === undefined) {
    assert.sameValue(propdesc, undefined);
  } else {
    assert.sameValue(propdesc.value, expected);
  }
}