### Question:
JsonWebTokenUtil { public static boolean isNotJsonWebToken(String jwt) { return jwt.split("\\.").length != COUNT_3; }  static String issueJwt(String id, String subject, String issuer, Long period,
                                  List<String> roles, List<String> permissions,
                                  Boolean isRefresh, SignatureAlgorithm algorithm); static boolean isNotJsonWebToken(String jwt); static Claims parseJwt(String jwt); static void setSecretKey(String secretNowKey);  }### Answer:
@Test public void isNotJsonWebToken() { String jwt = JsonWebTokenUtil.issueJwt(UUID.randomUUID().toString(), "tom", "token-server", 36000L, Arrays.asList("role2", "rol3"), null, Boolean.FALSE, SignatureAlgorithm.HS512); boolean flag = JsonWebTokenUtil.isNotJsonWebToken(jwt); assertFalse(flag); flag = JsonWebTokenUtil.isNotJsonWebToken("gsgdsghdbhegxhsgdjsdj"); assertTrue(flag); }