How to mock NATs in unit test (Nest.js)

test.controller.spec.ts

import { ClientProxy } from '@nestjs/microservices';

const clientMock: Partial<ClientProxy> = {};
 
describe('test', () => {
  beforeEach(async () => {
     const app: TestingModule = await Test.createTestingModule({
       /* 
       ...
       */
       providers: [
         {
           provide: 'NATS',
           useValue: clientMock
         }
       ]
     });
  });
});