def METHOD_NAME(self):
    """Initialize some filesystems with valid and invalid UUIDs."""
    # File systems that accept real UUIDs (RFC 4122)
    for fscls in [fs.Ext2FS, fs.JFS, fs.ReiserFS, fs.XFS, fs.HFSPlus]:
        uuid = "0invalid-uuid-with-righ-tlength00000"
        self.assertFalse(fscls().uuid_format_ok(uuid))
        uuid = "01234567-12341234123401234567891a"
        self.assertFalse(fscls().uuid_format_ok(uuid))
        uuid = "0123456-123-123-123-01234567891"
        self.assertFalse(fscls().uuid_format_ok(uuid))
        uuid = "01234567-xyz-1234-1234-1234-012345678911"
        self.assertFalse(fscls().uuid_format_ok(uuid))
        uuid = "01234567-1234-1234-1234-012345678911"
        self.assertTrue(fscls().uuid_format_ok(uuid))
    self.assertFalse(fs.FATFS().uuid_format_ok("1234-56789"))
    self.assertFalse(fs.FATFS().uuid_format_ok("abcd-ef00"))
    self.assertFalse(fs.FATFS().uuid_format_ok("12345678"))
    self.assertTrue(fs.FATFS().uuid_format_ok("1234-5678"))
    self.assertTrue(fs.FATFS().uuid_format_ok("ABCD-EF01"))
    self.assertFalse(fs.NTFS().uuid_format_ok("12345678901234567"))
    self.assertFalse(fs.NTFS().uuid_format_ok("abcdefgh"))
    self.assertFalse(fs.NTFS().uuid_format_ok("abcdefabcdefabcd"))
    self.assertTrue(fs.NTFS().uuid_format_ok("1234567890123456"))
    self.assertTrue(fs.NTFS().uuid_format_ok("ABCDEFABCDEFABCD"))