node/test/parallel/test-intl.js

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'use strict';
const common = require('../common');
const assert = require('assert');

// does node think that i18n was enabled?
let enablei18n = process.config.variables.v8_enable_i18n_support;
if (enablei18n === undefined) {
  enablei18n = 0;
}

// Returns true if no specific locale ids were configured (i.e. "all")
// Else, returns true if loc is in the configured list
// Else, returns false
function haveLocale(loc) {
  const locs = process.config.variables.icu_locales.split(',');
  return locs.includes(loc);
}

// Always run these. They should always pass, even if the locale
// param is ignored.
assert.strictEqual('Ç'.toLocaleLowerCase('el'), 'ç');
assert.strictEqual('Ç'.toLocaleLowerCase('tr'), 'ç');
assert.strictEqual('Ç'.toLowerCase(), 'ç');

assert.strictEqual('ç'.toLocaleUpperCase('el'), 'Ç');
assert.strictEqual('ç'.toLocaleUpperCase('tr'), 'Ç');
assert.strictEqual('ç'.toUpperCase(), 'Ç');

if (!common.hasIntl) {
  const erMsg =
    `"Intl" object is NOT present but v8_enable_i18n_support is ${enablei18n}`;
  assert.strictEqual(enablei18n, 0, erMsg);
  common.skip('Intl tests because Intl object not present.');
} else {
  const erMsg =
    `"Intl" object is present but v8_enable_i18n_support is ${
      enablei18n}. Is this test out of date?`;
  assert.strictEqual(enablei18n, 1, erMsg);

  // Construct a new date at the beginning of Unix time
  const date0 = new Date(0);

  // Use the GMT time zone
  const GMT = 'Etc/GMT';

  // Construct an English formatter. Should format to "Jan 70"
  const dtf = new Intl.DateTimeFormat(['en'], {
    timeZone: GMT,
    month: 'short',
    year: '2-digit'
  });

  // If list is specified and doesn't contain 'en' then return.
  if (process.config.variables.icu_locales && !haveLocale('en')) {
    common.printSkipMessage(
      'detailed Intl tests because English is not listed as supported.');
    // Smoke test. Does it format anything, or fail?
    console.log(`Date(0) formatted to: ${dtf.format(date0)}`);
    return;
  }

  // Check casing
  {
    assert.strictEqual('I'.toLocaleLowerCase('tr'), 'ı');
  }

  // Check with toLocaleString
  {
    const localeString = dtf.format(date0);
    assert.strictEqual(localeString, 'Jan 70');
  }
  // Options to request GMT
  const optsGMT = { timeZone: GMT };

  // Test format
  {
    const localeString = date0.toLocaleString(['en'], optsGMT);
    assert.strictEqual(localeString, '1/1/1970, 12:00:00 AM');
  }
  // number format
  {
    const numberFormat = new Intl.NumberFormat(['en']).format(12345.67890);
    assert.strictEqual(numberFormat, '12,345.679');
  }
  // Significant Digits
  {
    const loc = ['en-US'];
    const opts = { maximumSignificantDigits: 4 };
    const num = 10.001;
    const numberFormat = new Intl.NumberFormat(loc, opts).format(num);
    assert.strictEqual(numberFormat, '10');
  }

  const collOpts = { sensitivity: 'base', ignorePunctuation: true };
  const coll = new Intl.Collator(['en'], collOpts);

  // ignore punctuation
  assert.strictEqual(coll.compare('blackbird', 'black-bird'), 0);
  // compare less
  assert.strictEqual(coll.compare('blackbird', 'red-bird'), -1);
  // compare greater
  assert.strictEqual(coll.compare('bluebird', 'blackbird'), 1);
  // ignore case
  assert.strictEqual(coll.compare('Bluebird', 'bluebird'), 0);
  // ffi ligature (contraction)
  assert.strictEqual(coll.compare('\ufb03', 'ffi'), 0);
}