Simple component interaction test using enzyme & jest

button.test.js

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

const testClick = jest.fn();

test("Button component onClick", () => {
  const component = shallow(<Button handleClick={testClick}>Button</Button>);
  component.find("button").simulate("click");
  expect(testClick).toHaveBeenCalled();
});