Test Issue

MxTimeline.jsx

import React, { useState, useEffect } from 'react';
import Timeline from 'react-calendar-timeline';
import 'react-calendar-timeline/lib/Timeline.css';
import moment from 'moment';
import { DefaultApi } from 'mpt_api';

const MxTimeline = () => {
  const [items, setItems] = useState(null);
  const [groups, setGroups] = useState(null);
  const apiInstance = new DefaultApi();

  const loadData = () => {
    const opts = {};
    apiInstance.getEvents(opts).then(data => {
      const bunos = data
        .map(b => b.buno)
        .filter((val, index, self) => self.indexOf(val) === index)
        .map(val => ({
          id: val,
          title: val,
        }));
      const events = data.map(event => ({
        id: event.id,
        group: event.buno,
        title: event.name,
        mx_type: event.mxType,
        start_time: moment(event.startDate),
        end_time: moment(event.endDate),
        itemProps: {
          style: {
            background: 'gray',
          },
        },
      }));
      setGroups(bunos);
      setItems(events);
    });
  };

  useEffect(() => {
    loadData();
  }, []);

  return (
    <div className="mx-timeline">
      {groups && items && (
        <Timeline
          groups={groups}
          items={items}
          defaultTimeStart={moment().add(-15, 'day')}
          defaultTimeEnd={moment().add(15, 'day')}
          stackItems
        />
      )}
    </div>
  );
};

export default MxTimeline;

MxTimeline.test.js

import React from 'react';
import MxTimeline from '../MxTimeline';
import { render } from '@testing-library/react';
import { DefaultApi } from 'mpt_api'

jest.mock('mpt_api');

describe('<MxTimeline />', () => {
  it('return a mock api response', () => {
    const apiInstance = new DefaultApi;
    apiInstance.getEvents.mockResolvedValueOnce({});
  
    render(<MxTimeline />);
    expect(apiInstance.getEvents).toHaveBeenCalledTimes(1);
    //expect(jest.isMockFunction(getEvents)).toBeTruthy();
    //return apiInstance.getEvents({}).then(data => expect(data).toEqual({}));
  })
});