They want them to use 16personalities and share the results. These personality test sites are out of control, promoting their services like a horoscope. One actually sends out a daily newsletter to help you tackle your day.
The main problem is HR could be using this as a way to evaluate their employees. If you're in sales, you certainly don't want to come up introverted. I'm not sure if I should bother trying to argue the risks or just ignore it altogether.