fluence-js/jest-patched-jsdom.js

const Environment = require('jest-environment-jsdom');

module.exports = class CustomTestEnvironment extends Environment {
    async setup() {
        await super.setup();
        if (typeof this.global.TextEncoder === 'undefined') {
            const { TextEncoder, TextDecoder } = require('util');
            this.global.TextEncoder = TextEncoder;
            this.global.TextDecoder = TextDecoder;
            this.global.Uint8Array = Uint8Array;
            this.global.ArrayBuffer = ArrayBuffer;
        }
    }
};