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' ) ; } ) ; } ) ;