The trouble with that, surely, is that it relies one one's perception of oneself, which is notoriously unreliable? I mean, I think I'm an INTP, but people who know me might think otherwise.
Printable View
Most assessments they do these days are pretty reliable, but admittedly not 100% accurate.
Over the years I have taken many tests and have only ever got a result of ISTP or ISTJ.
The feedback I got from others has always been that it was pretty accurate.