To test FUSE with xfstests¹:

1. copy the mount.fuse.passthrough file into /sbin and edit the PASSTHROUGH_PATH, SCRATCH_SOURCE and TEST_SOURCE variables as needed.

2. Make sure that the SCRATCH_SOURCE and TEST_SOURCE directories exist.

3. Copy local.config into your xfstests directory

Tests can then be run with e.g.:

# make
# sudo ./check -fuse -b

¹https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git/about/