Mock actions after creating service in moleculer microservice Nodejs

Question

I want to test an action. Inside that service action, I am calling another service action. code looks like below

describe("Test auth service", () => {
    describe("action", ()=>{
        let broker = new ServiceBroker({
            logger: false,
        });

        let authService = broker.createService(TestAuthService);
        let storageService = broker.createService(TestStorageService);

        beforeAll(() => broker.start());
        afterAll(() => broker.stop());

        for (
            let i = 0;
            i < params.length;
            i++
        ) {
            const {
                testName,
                input,
                expectedResponse,
            } = params[i];

            describe("unit test", () => {
                afterAll(() => {
                    //Tear down
                });
                storageService.actions.uploadPhotoToStorage = jest.fn(()=> Prmoise.resolve("Uploaded"))
                test(testName, async () => {
                    const userData = await dummyUserSignup(apiService, authService);
                    const uploadVideoResponse = await broker.call("auth.uploadPhoto", {...input, user: userData});
                    //assert
                });
            });
        }
    })
});

There is a uploadPhoto action present in auth service. From uploadPhoto action I am calling uploadPhotoToStorage in storage service. I wanted to mock the uploadPhotoToStorage in storage service.

Is there any way I can mock action after creating the service.