Java 为SpringCache实现编写junit测试用例的输入

我正在用Redis缓存实现spring引导应用程序。我正在寻找有关如何为缓存实现编写junit测试用例的信息。下面是示例代码

代码从链接中引用：

缓存的示例代码（keygenerator）

关于如何使用junit jupiter为上述UserServiceImpl编写junit测试用例的任何信息

    class UserServiceImpl{
    ...
    @Cacheable(value = "usercache",keyGenerator = "wiselyKeyGenerator", unless="#result==null")  
    public Object findUser(){
    //business logic
    ...
    //return the value
    }
   @Cacheable(value = "usercache",keyGenerator = "wiselyKeyGenerator")  
    public User findUser(Long id,String firstName,String lastName){  
        System.out.println("Call here when there is no cache");
        return new User(id,firstName,lastName);  
    }  

    }

@Bean  
public KeyGenerator wiselyKeyGenerator(){  
    return new KeyGenerator() {  
        @Override  
        public Object generate(Object target, Method method, Object... params) {  
            StringBuilder sb = new StringBuilder();  
            sb.append(target.getClass().getName());  
            sb.append(method.getName());  
            for (Object obj : params) {  
                sb.append(obj.toString());  
            }  
            return sb.toString();  
        }  
    };  
  
}