svelte-i18n/test/runtime/stores/formatters.test.ts

import { get } from 'svelte/store';

import {
  $format,
  $formatTime,
  $formatDate,
  $formatNumber,
} from '../../../src/runtime/stores/formatters';
import { init } from '../../../src/runtime/configs';
import { addMessages } from '../../../src/runtime/stores/dictionary';
import { $locale } from '../../../src/runtime/stores/locale';
import {
  MessageFormatter,
  TimeFormatter,
  DateFormatter,
  NumberFormatter,
} from '../../../src/runtime/types';

let formatMessage: MessageFormatter;
let formatTime: TimeFormatter;
let formatDate: DateFormatter;
let formatNumber: NumberFormatter;

$locale.subscribe(() => {
  formatMessage = get($format);
  formatTime = get($formatTime);
  formatDate = get($formatDate);
  formatNumber = get($formatNumber);
});

addMessages('en', require('../../fixtures/en.json'));
addMessages('en-GB', require('../../fixtures/en-GB.json'));
addMessages('pt', require('../../fixtures/pt.json'));
addMessages('pt-BR', require('../../fixtures/pt-BR.json'));
addMessages('pt-PT', require('../../fixtures/pt-PT.json'));

beforeEach(() => {
  init({ fallbackLocale: 'en' });
});

test('formats a message by its id and the current locale', () => {
  expect(formatMessage({ id: 'form.field_1_name' })).toBe('Name');
});

test('formats a message by its id and the a passed locale', () => {
  expect(formatMessage({ id: 'form.field_1_name', locale: 'pt' })).toBe('Nome');
});

test('formats a message with interpolated values', () => {
  expect(formatMessage({ id: 'photos', values: { n: 0 } })).toBe(
    'You have no photos.',
  );
  expect(formatMessage({ id: 'photos', values: { n: 1 } })).toBe(
    'You have one photo.',
  );
  expect(formatMessage({ id: 'photos', values: { n: 21 } })).toBe(
    'You have 21 photos.',
  );
});

test('accepts a message id as first argument', () => {
  expect(formatMessage('form.field_1_name')).toBe('Name');
});

test('accepts a message id as first argument and formatting options as second', () => {
  expect(formatMessage('form.field_1_name', { locale: 'pt' })).toBe('Nome');
});

test('throws if no locale is set', () => {
  $locale.set(null);
  expect(() => formatMessage('form.field_1_name')).toThrow(
    '[svelte-i18n] Cannot format a message without first setting the initial locale.',
  );
});

test('uses a missing message default value', () => {
  expect(formatMessage('missing', { default: 'Missing Default' })).toBe(
    'Missing Default',
  );
});

test('warn on missing messages', () => {
  const { warn } = global.console;

  jest.spyOn(global.console, 'warn').mockImplementation();

  formatMessage('missing');

  expect(console.warn).toBeCalledWith(
    `[svelte-i18n] The message "missing" was not found in "en".`,
  );

  global.console.warn = warn;
});

describe('format utilities', () => {
  it('time', () => {
    expect(formatTime(new Date(2019, 0, 1, 20, 37))).toBe('8:37 PM');
  });
  it('date', () => {
    expect(formatDate(new Date(2019, 0, 1, 20, 37))).toBe('1/1/19');
  });
  it('number', () => {
    expect(formatNumber(123123123)).toBe('123,123,123');
  });
});