Personality tests at work or for hiring should be illegal. It's the misuse of psychology IMO. Employees need to protected from this type of stuff as a basic employee protection. But unfortunately that is not the law at present.
Much is not scientific (but nonetheless I do like Meyer's Briggs as an explanatory system - but not for employment - anymore than your sexual life is your employers business, but use personality tests for personal curiosity or therapy or career counseling, ok I don't have a problem with these more VOLUNTARY uses of them ...). And that which is scientific is mostly heritable, a lot of personalities traits are fairly heritable. So like I say it has no place in employment.
Now this doesn't mean their intent in giving the test was evil, they may just want coworkers to work together better despite different personality types, or bosses to motivate various types of employees better etc.. The problem is most organizations are too busy trying to get actual work done (maybe inefficiently but nonetheless) to really bother with HR and whatever theory they have come up with today. Management and organization and personnel theories are a dime a dozen and mostly pretty useless from what I've seen.