When it is necessary to take a job personality test, make sure that the tester is. Check if they are certified enough to facilitate the test. Know your rights too. You could be charged for the test at an unreasonable amount. You need to know if the company makes only money from you.
Most companies have left psychologists to facilitate the test. Psychologists have a certain code and conduct a guide when performing tasks such as employment personality tests. You can check this information so that you know your rights. You can even get your personality test done online via https://icareertest.com/ without any hassle.
They treat test takers with respect and you are assured that the results are not handled. If the facilitator is not a registered psychologist, chances are high that there will be discrimination.
You have the right to refuse to take a test or take some part. This can prevent you from not having work. Make sure when you refuse, you have a base to do it. One of the reasons maybe you think the test is inaccurate or not really necessary, otherwise, the facilitator has abused you in one way or another. You can attract this attention from the company or society that provides test questions.
Companies have already defined a profile of an ideal employee. By making you take the job personality test, you are weighed and checked if you get close enough to that of the ideal employee profile.
The profile is based on the position you are applying for. So, if you are well balanced but you do not match this profile, they would think you may not be compatible with the tasks assigned to you.