Asas Bertindakbalas~ujian unit/ui

import Greet from "./components/Greet";

const Example = () => {
  return <Greet />;
};

export default Example;

const Greet = () => {
  return (
    <div>
      <form>
        <h1>Hello</h1>
        <input type="radio" />
        <label htmlFor="fullname">Fullname</label>
        <input id="fullname" type="text" placeholder="Fullname" />
        <button>button1</button>
        <button>button2</button>
        <img src="/logo512.png" alt="React Logo" />
        <h2>Hello2</h2>
      </form>
    </div>
  );
};

export default Greet;

import { render, screen } from "@testing-library/react";
import Greet from "./Greet";

test("Whether elements exists or not", () => {
  const { debug, container } = render(<Greet />);
  //get the h1 element
  const h1El = screen.getByText("Hello");
  expect(h1El).toBeInTheDocument();

  //get the h2 element by specifying the name
  const headEl = screen.getByRole("heading", { name: "Hello2" });
  debug(headEl);
  expect(headEl).toBeInTheDocument();

  //get radio button
  const radioEl = screen.getByRole("radio");
  debug(radioEl);
  expect(radioEl).toBeInTheDocument();

  //get the img element
  const imgEl = screen.getByRole("img");
  debug(imgEl);
  expect(imgEl).toBeInTheDocument();

  //get the h1 element by getting the alt
  const imgEl2 = screen.getByAltText("React Logo");
  debug(imgEl2);
  expect(imgEl2).toBeInTheDocument();

  //get the h2 element by using the querySelector of container
  const h2El = container.querySelector("h2");
  debug(h2El);
  expect(h2El).toBeInTheDocument();

  //get an element by getting the labe
  const elByLabel = screen.getByLabelText("Fullname");
  debug(elByLabel);
  expect(elByLabel).toBeInTheDocument();

  //get an element by getting the placeholder
  const elByPlaceholder = screen.getByPlaceholderText("Fullname");
  debug(elByPlaceholder);
  expect(elByPlaceholder).toBeInTheDocument();
});

const { debug, container } = render(<Greet />);