INFJ here. I was tested as part of a work-related "culture change" project, where my department spent far too long at an off-site retreat with consultants, after which nothing significant changed at all in the work culture, of course.
The consultants were nice enough people. I don't think they expected to find any INFJs; they asked me to retake the test, with the same results.
(I was diagnosed Aspie about 18 months after this.)
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"I believe you find life such a problem because you think there are the good people and the bad people," said the man. "You're wrong, of course. There are, always and only, the bad people, but some of them are on opposite sides."
-- Terry Pratchett, Guards! Guards!