This package contains polyfills for Web APIs that we use from the Inrupt SDKs that don't currently exist in jsdom which is used by Jest.
npm install --save-dev @inrupt/jest-jsdom-polyfills
Add the following line to your Jest Test Setup file, usually you'll have this configured as jest.setup.ts or something similar.
import "@inrupt/jest-jsdom-polyfills"
Done, the SDKs should now have everything they need to be tested via jest / jsdom.
The Inrupt SDKs currently rely on some modules that require ESM, in order to load those with Jest, you need to opt into using ESM and configure your environment appropriately.