Personality type testing.
Well, basically, afaik humanity struggles to find friends, form better connections.
Because usually when I met some one nice who like some thing that I do, after awhile I see it's hard to cope with mismatch on other tastes.
So few tests like MBTI, Big5, (even Zodiac Horoscope matching) were invented.
But those said, don't do perfect matches.
Are you aware of any really good psychological tests to match strangers to make them friends?

I don't trust personality testing. You can't get to know someone by looking at a test score, an acronym or a bunch of labels. Using personality tests would make our struggles worse. You'd get all the annoying drama of sexual orientations (am I really X or Y..), you'd get discrimination against those people who's label or score is seen as bad or undesirable, and none of these labels and scores could ever accurately represent a living, breathing person anyway.

when I met some one nice who like some thing that I do, after awhile I see it's hard to cope with mismatch on other tastes.

This is the problem. People have become too egocentric. Before, you had to learn to live with other people and couldn't just cherry pick your friends from a crowd. What you want isn't a friend but sameness, a mirror.

whenever i took those i was always shifting between intp and infp