How to use the pyfuse3.listdir function in pyfuse3

def tst_mkdir(self):
        dirname = self.newname()
        fullname = self.mnt_dir + "/" + dirname
        os.mkdir(fullname)
        fstat = os.stat(fullname)
        assert stat.S_ISDIR(fstat.st_mode)
        assert pyfuse3.listdir(fullname) ==  []
        assert fstat.st_nlink == 1
        assert dirname in pyfuse3.listdir(self.mnt_dir)
        os.rmdir(fullname)
        assert_raises(FileNotFoundError, os.stat, fullname)
        assert dirname not in pyfuse3.listdir(self.mnt_dir)

def tst_link(self):
        name1 = os.path.join(self.mnt_dir, self.newname())
        name2 = os.path.join(self.mnt_dir, self.newname())
        src = self.src
        shutil.copyfile(src, name1)
        assert filecmp.cmp(name1, src, False)
        os.link(name1, name2)

        fstat1 = os.lstat(name1)
        fstat2 = os.lstat(name2)

        assert fstat1 == fstat2
        assert fstat1.st_nlink == 2

        assert basename(name2) in pyfuse3.listdir(self.mnt_dir)
        assert filecmp.cmp(name1, name2, False)
        os.unlink(name2)
        fstat1 = os.lstat(name1)
        assert fstat1.st_nlink == 1
        os.unlink(name1)

def tst_readdir(self):
        dir_ = os.path.join(self.mnt_dir, self.newname())
        file_ = dir_ + "/" + self.newname()
        subdir = dir_ + "/" + self.newname()
        subfile = subdir + "/" + self.newname()
        src = self.src

        os.mkdir(dir_)
        shutil.copyfile(src, file_)
        os.mkdir(subdir)
        shutil.copyfile(src, subfile)

        listdir_is = pyfuse3.listdir(dir_)
        listdir_is.sort()
        listdir_should = [ basename(file_), basename(subdir) ]
        listdir_should.sort()
        assert listdir_is == listdir_should

        os.unlink(file_)
        os.unlink(subfile)
        os.rmdir(subdir)
        os.rmdir(dir_)

def tst_symlink(self):
        linkname = self.newname()
        fullname = self.mnt_dir + "/" + linkname
        os.symlink("/imaginary/dest", fullname)
        fstat = os.lstat(fullname)
        assert stat.S_ISLNK(fstat.st_mode)
        assert os.readlink(fullname) == "/imaginary/dest"
        assert fstat.st_nlink == 1
        assert linkname in pyfuse3.listdir(self.mnt_dir)
        os.unlink(fullname)
        assert_raises(FileNotFoundError, os.lstat, fullname)
        assert linkname not in pyfuse3.listdir(self.mnt_dir)

# Try to delete
        assert_raises(PermissionError, os.unlink, filename)

        # Try to write
        with pytest.raises(PermissionError):
            open(filename, 'w+').write('Hello')

        # delete properly
        try:
            s3ql.remove.main([tempdir])
        except:
            sys.excepthook(*sys.exc_info())
            pytest.fail("s3qlrm raised exception")

        assert 'lock_dir' not in pyfuse3.listdir(self.mnt_dir)

uid_new = uid + 1
        os.chown(filename, uid_new, -1)
        fstat = os.lstat(filename)
        assert fstat.st_uid == uid_new
        assert fstat.st_gid == gid

        gid_new = gid + 1
        os.chown(filename, -1, gid_new)
        fstat = os.lstat(filename)
        assert fstat.st_uid == uid_new
        assert fstat.st_gid == gid_new

        os.rmdir(filename)
        assert_raises(FileNotFoundError, os.stat, filename)
        assert basename(filename) not in pyfuse3.listdir(self.mnt_dir)

'''Raise `QuietError` if *path* is not on an S3QL file system

    Returns name of the S3QL control file.
    '''

    try:
        os.stat(path)
    except FileNotFoundError:
        raise QuietError('%s does not exist' % path)
    except OSError as exc:
        if exc.errno is errno.ENOTCONN:
            raise QuietError('File system appears to have crashed.')
        raise

    ctrlfile = os.path.join(path, CTRL_NAME)
    if not (CTRL_NAME not in pyfuse3.listdir(path)
            and os.path.exists(ctrlfile)):
        raise QuietError('%s is not on an S3QL file system' % path)

    return ctrlfile