portainer/app/setup-tests/setup-msw.ts

import { server } from './server';

beforeAll(() =>
  server.listen({
    onUnhandledRequest: 'error',
  })
);
// if you need to add a handler after calling setupServer for some specific test
// this will remove that handler for the rest of them
// (which is important for test isolation):
afterEach(() => server.resetHandlers());
afterAll(() => server.close());