how to unit test with jest a redux middleware with promises

my-middleware.spec.js

// unit test of redux middleware w/ jest

import configureStore from './configure-store';

const middleware = store => next => (action) => {
  if (action.type === 'FOO') {
    Promise.resolve({ type: 'FOO_SUCCESS', payload: {} }).then(act => store.dispatch(act);
  }

  return next(action);
};

const store = configureStore({});

describe('handle FOO', async () => {
  it('dispatch FOO_SUCCESS', () => {
    store.dispatch = jest.fn(store.dispatch);
    await middleware(store)(() => {})({ type: 'FOO', payload: {});
    // Following is always false because the dispatch is within a promise wich is resolved after the 
    // next(action) is returned. 
    expect(store.dispatch.mock.calls).toContain({ type: 'FOO_SUCCESS', payload: {} }); 
  });
});