Redux Saga mock onSuccess and onError response from the API

Question

I'm new to redux-saga and i'm trying to make some api calls using the redux-saga as well as trying to write some unit testing using the Jest. But i'm not able to mock the onSuccess and onError reponse part in the code.

export function* login() {
try {
  yield call(
    request,
    api_url,
    {
      method: "POST",
      body: {
        username: 'user',
        password: 'pass',
      },
    },
    {
      onSuccess(response) {
        store.dispatch(loginRes(response));
      },
      onError(error) {},
    },
    false
  );
} catch (error) {

}
}

I'm able to cover the yield call part but I'm not able to figure out how the onSuccess and onError part can be covered.

describe('sample saga test', () => {
test('should call the login api with success response ', () => { 
    const generator = login();
    const response = {
        'status': '200',
        'access': 'asdfara',
        'refresh': 'dsnajfnkrufa'
    };
    expect(generator.next().value);
    // expect(generator.next(response).value).toBe(response);
 })

this is the test case that i've tried with can anyone please give some solution on how i can cover the other part.