Jestjs 如何测试useRef'；现在，用笑话和酶？

我有一个Demo.tsx文件，其代码如下：

const aRef = useRef() as RefObject<HTMLDivElement>;
const bRef = useRef() as RefObject<HTMLDivElement>;
const a = 10;
const b = 10;
useEffect(() => {
  if (!!aRef.current && !!bRef.current) {
    const temp = functionRefCall({ARef:aref,Bref:bref,A:a,B:b})
  }
}, [aRef, bRef]);
return (

      <div className="aRef-container" ref={aRef} />
      <div className="bRef-container" ref={bRef} />

  </div>

);

如果我的ref不为null，我将如何测试调用functionRefCall并返回a+b

export interface myInterface {
  Aref: HTMLElement;
  Bref: HTMLElement;
  A: number;
  B:  number;
}

export default (
  i18n: i18n,
  {Aref,Bref,A,B }: myInterface,
) => {
return a+b;
}