import es from 'date-fns/locale/es' ; import { formatMonthCaption } from './formatMonthCaption' ; const date = new Date ( 2022 , 10 , 21 ) ; test ( 'should return the formatted month caption' , ( ) => { expect ( formatMonthCaption ( date ) ) . toEqual ( 'November' ) ; } ) ; describe ( 'when a locale is passed in' , ( ) => { test ( 'should format using the locale' , ( ) => { expect ( formatMonthCaption ( date , { locale : es } ) ) . toEqual ( 'noviembre' ) ; } ) ; } ) ;