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Re:Bcachefs: “the COW filesystem for Linux that won't eat yo... by kev009 on Wednesday March 22, 2017 @05:16PM (#13935051)
https://github.com/kdave/xfstests is the old standard. Folks have also been using AFL to fuzz. In ZFS, zdb is often used for similar purposes.
Re:Bcachefs: “the COW filesystem for Linux that won't eat yo... by koverstreet on Wednesday March 22, 2017 @08:22PM (#13936423)
xfstests is still the standard, on Linux - https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git

I use it pretty much every day.