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Introduction
pjdfstest is a POSIX file system test suite available for UFS and ZFS on FreeBSD. It's also available for extfs (Linux) and HFS+ (OSX).
History
pjdfstest was originally added to FreeBSD in the 8.x timeframe here.
In the 10.x timeframe, pjdfstest was integrated in to the FreeBSD Test Suite in a limited fashion here. In particular, it's built/installed with FreeBSD when MK_TESTS != no, but doesn't run automatically with the FreeBSD test suite, i.e., is opt-in by design.
Running pjdfstest
Directions for how to run pjdfstest live in share/doc/pjdfstest/README.