public void sha256EncryptNullTest()
        {
            string             str_encryp    = "hola";
            SHA256Encriptation _encriptation = new SHA256Encriptation();
            string             resp          = _encriptation.sha256Encrypt(str_encryp);

            Assert.IsNotNull(resp);
        }
        public void sha256EncryptTest()
        {
            string             str_encryp    = "hola";
            SHA256Encriptation _encriptation = new SHA256Encriptation();
            string             resp          = _encriptation.sha256Encrypt(str_encryp);

            Assert.AreNotEqual(str_encryp, resp);
        }