react-day-picker/src/contexts/DayPicker/formatters/formatCaption.test.ts

Customizable Date Picker for React

import es from 'date-fns/locale/es';

import { formatCaption } from './formatCaption';

const date = new Date(2022, 10, 21);

test('should return the formatted caption', () => {
  expect(formatCaption(date)).toEqual('November 2022');
});

describe('when a locale is passed in', () => {
  test('should format using the locale', () => {
    expect(formatCaption(date, { locale: es })).toEqual('noviembre 2022');
  });
});