Jest: test Intl.DateTimeFormat

Question

I would like to test a filter function I wrote which return a date formatted using Intl.DateTimeFormat(\'en-GB\', options):

// module \"date.js\"
export default          


        

Answer 1

You can use polyfill, as described here

import IntlPolyfill from 'intl';
import 'intl/locale-data/jsonp/ru';

if (global.Intl) {
    Intl.NumberFormat = IntlPolyfill.NumberFormat;
    Intl.DateTimeFormat = IntlPolyfill.DateTimeFormat;
} else {
    global.Intl = IntlPolyfill;
}