I've been looking all around for an answer to this and I am not seeing it. I have a file that has a functional component and a function. The function is supposed to interact with the JSX of the functional component. The code is like this. In a FunctionalComponent.test.js file, how am I supposed to test that the color() function changes the property of the FunctionalComponent properly?

function color() {
  //Change the color of the element with id 'container'
}

export default function FunctionalComponent() {
  return(
    <div id="container">
      
    </div>
  )
}