Assertions using Jest, Enzyme, and Snapshots

SampleUnitTests.jsx

import React from 'react';
import { shallow } from 'enzyme';
import toJSON from 'enzyme-to-json';

import StarRating from '../components/StarRating';

describe('StarRating sharedComponent', () => {
    it('should match a snapshot', () => {
        const wrapper = shallow(<StarRating />);
        expect(toJSON(wrapper)).toMatchSnapshot();
    });

    it('should have a single review', () => {
        const wrapper = shallow(<StarRating rating={1} voteCount={1} />);
        expect(wrapper.find('.vote-count').text()).toBe('1 Review');
    });

    it('should handle half stars', () => {
        const wrapper = shallow(<StarRating rating={3.5} voteCount={5} />);
        expect(wrapper.find('.stars-container IconStarHalf')).toBeDefined();
    });
});