'The mountpoint of the filesystem is the actual ZFS mountpoint.'

def test_actual_mountpoint(self):

    mount_root = FilePath(self.mktemp())
    pool_name = create_zfs_pool(self)
    pool = StoragePool(reactor, pool_name, mount_root)
    service = service_for_pool(self, pool)
    volume = service.get(MY_VOLUME)
    d = pool.create(volume)
    def gotFilesystem(filesystem):
        self.assertEqual(filesystem.get_path().path, subprocess.check_output(['zfs', 'get', '-H', '-o', 'value', 'mountpoint', filesystem.name]).strip())
    d.addCallback(gotFilesystem)
    return d
