我有加载页面：

const Loading: React.FunctionComponent = () => {
    return (
        <div className="w-screen h-screen overflow-hidden">
            <LoadingBackground />
        </div>
    );
};

如何测试LoadingBackground是否已渲染？

import { render } from "@testing-library/react";
import Loading from "./Loading";
import LoadingBackground from "../../components/LoadingBackground";

test("Loading", () => {
        const parent = render(<Loading />);
        expect(parent).toContainElement(loadingBackground); <-- Check if LoadingBackground is rendered or not?
});