JSTests/test262/test/intl402/DateTimeFormat/prototype/formatToParts/fractionalSecondDigits.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 basic handling of fractionalSecondDigits.
features: [Intl.DateTimeFormat-fractionalSecondDigits]
locale: [en-US]
---*/

const d1 = new Date(2019, 7, 10,  1, 2, 3, 234);
const d2 = new Date(2019, 7, 10,  1, 2, 3, 567);

function assertParts(parts, minute, second, fractionalSecond, message) {
  if (fractionalSecond === null) {
    assert.sameValue(parts.length, 3, `length should be 3, ${message}`);
  } else {
    assert.sameValue(parts.length, 5, `length should be 5, ${message}`);
  }
  assert.sameValue(parts[0].value, minute, `minute part value. ${message}`);
  assert.sameValue(parts[0].type, 'minute', `minute part type. ${message}`);
  assert.sameValue(parts[1].value, ':', `literal part value. ${message}`);
  assert.sameValue(parts[1].type, 'literal', `literal part type. ${message}`);
  assert.sameValue(parts[2].value, second, `second part value. ${message}`);
  assert.sameValue(parts[2].type, 'second', `second part type. ${message}`);
  if (fractionalSecond !== null) {
    assert.sameValue(parts[3].value, '.', `literal part value. ${message}`);
    assert.sameValue(parts[3].type, 'literal', `literal part type. ${message}`);
    assert.sameValue(parts[4].value, fractionalSecond, `fractionalSecond part value. ${message}`);
    assert.sameValue(parts[4].type, 'fractionalSecond', `fractionalSecond part type. ${message}`);
  }
}

let dtf = new Intl.DateTimeFormat(
    'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: 0});
assertParts(dtf.formatToParts(d1), "02", "03", null, "no fractionalSecondDigits round down");
assertParts(dtf.formatToParts(d2), "02", "03", null, "no fractionalSecondDigits round down");

dtf = new Intl.DateTimeFormat(
    'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: 1});
assertParts(dtf.formatToParts(d1), "02", "03", "2", "1 fractionalSecondDigits round down");
assertParts(dtf.formatToParts(d2), "02", "03", "5", "1 fractionalSecondDigits round down");

dtf = new Intl.DateTimeFormat(
    'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: 2});
assertParts(dtf.formatToParts(d1), "02", "03", "23", "2 fractionalSecondDigits round down");
assertParts(dtf.formatToParts(d2), "02", "03", "56", "2 fractionalSecondDigits round down");

dtf = new Intl.DateTimeFormat(
    'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: 3});
assertParts(dtf.formatToParts(d1), "02", "03", "234", "3 fractionalSecondDigits round down");
assertParts(dtf.formatToParts(d2), "02", "03", "567", "3 fractionalSecondDigits round down");