It's almost a given now that, if we want to work with people, we need to know their personality traits. Most managers have been to some sort of personality "typing" workshop to help them understand how to get the most from their team members and get along with their own managers. Some of the more popular offerings used in the corporate world and for human resource hiring include the DiSC, and Prevue. A number of other are also popular for both team building and hiring purposes: the Myers-Briggs Type Indicator (MBTI), the 16PF (or 16 personality factor), and the "Big Five" also known as the "Five Factor Model." Not happy with any of these? Not to worry; there are dozens more to choose from.
I've completed many of these for myself and I've even administered and interpreted some of them to my clients during my career as a counselor. Some of their findings I resonate with; others I find to be a stretch. The problem isn't in the testing; it's how we treat people.