Testing method call in componentDidMount using Jest on HOC

I am trying to test the method call "fetchData" called in componentDidMount. I am using a High order component and have changed what needs to be changed but I don't know if that's everything, I have used export class ..., export default connect(...) and import {component} from './component' when calling it in the component.test.js

I can't find a solution to test the method was called when componentDidMount was called.

export class TestBase extends Component {
  constructor(props){
    super(props)
   ...

    }
  }
 ....
....


  componentDidMount(){
     this.fetchData();
  }

  fetchData = () =>{
    const URLtemplate = '/api/users/getUserScore?email=';
    const userEmail = this.props.auth.user.email;
    var userURL = URLtemplate.concat(userEmail);
    //console.log(userURL);
    fetch(userURL)
    .then(response => response.json())
    .then(contacts => {console.log(contacts);

    this.setState({
      storeOne: contacts
    }, () => {
      console.log(this.state.storeOne)
    });
  })
  .catch(error => console.log('parsing failing', error))
  // debugger;


  }


render() {
    ....
....
}

TestBase.propTypes = {
  logoutUser: PropTypes.func.isRequired,
  auth: PropTypes.object.isRequired,
  getTheScores: PropTypes.func.isRequired
};
const mapStateToProps = state => ({
  auth: state.auth
})

export default connect(
  mapStateToProps,
  { getTheScores, logoutUser }
)(TestBase);

My TestBase.test.js looks like this

import React from "react";
import { shallow } from "enzyme";
import {TestBase} from "./TestBase";
import { mount } from "enzyme";

describe("MyComponent", () => {
  const auth = {
    isAuthenticated: true,
    user: {
      id: "5ca0801291e0d7b175ea9ac5",
      name: "Aaron Chatrath",
      email: "testingabc@test.com"
    },
    loading: false
  };

  it("fetch to be called on componentDidMount", () => {

    const wrapper = shallow(<TestBase auth={auth} logoutUser={jest.fn()} getTheScores={jest.fn()}  />);
    const instance = wrapper.instance(); // you assign your instance of the wrapper
    jest.spyOn(instance, "fetchData"); // You spy on the fetchData
    instance.componentDidMount();
    expect(instance.fetchData).toHaveBeenCalledTimes();

  });
});

Here, it doesn't seem to be work and I am getting the error of

expect(received)[.not].toHaveBeenCalledTimes(expected)

Expected value must be a number.
Got: undefined

I am sure there is a fix for this but I am just coming to grips with jest and enzyme. If a solution to this can be found, I'd be grateful. I tried using mount but then it asks for the store and to be used to wrap it but I am only trying to test a single method call from componentDidMount.