Medium: Jest test with React DOM rendering

react-dom-test.js

import * as React from "react";
import ReactDOM from "react-dom";
import { Input } from "../";

test("it initializes with a defaultValue", () => {
  const containerDiv = document.createElement("div");
  const defaultValue = "DefaultValue";
  ReactDOM.render(<Input initialValue={defaultValue} />, containerDiv);
  expect(containerDiv.querySelector("input").value).toBe(
    defaultValue
  );
});