some_test.jsx

{
  startsWith() {
    return (
      <div id="hello">
      </div>
    );
  }
  
  test() {
    document.getElementById("hello")
    hello.textContent = "Hello World!"
  }
  
  endsWith() {
    return (
      <div id="hello">
        Hello World!
      </div>
    );
  }
}