// hello.test.js, againimport React from "react";import { render, unmountComponentAtNode } from "react-dom";import { act } from "react-dom/test-utils";import pretty from "pretty";import Hello from "./hello";let container = null;beforeEach(() => {  // setup a DOM element as a render target
  container = document.createElement("div");
  document.body.appendChild(container);});afterEach(() => {  // cleanup on exiting
  unmountComponentAtNode(container);
  container.remove();
  container = null;});it("should render a greeting", () => {
  act(() => {
    render(<Hello />, container);
  });
  expect(
    pretty(container.innerHTML)
  ).toMatchInlineSnapshot(); /* ... gets filled automatically by jest ... */
  act(() => {
    render(<Hello name="Jenny" />, container);
  });
  expect(
    pretty(container.innerHTML)
  ).toMatchInlineSnapshot(); /* ... gets filled automatically by jest ... */
  act(() => {
    render(<Hello name="Margaret" />, container);
  });
  expect(
    pretty(container.innerHTML)
  ).toMatchInlineSnapshot(); /* ... gets filled automatically by jest ... */});