public void Verify_ForFreshToken_ReturnsCorrectExpiryDate()
        {
            var mockedDateTimeProvider = new Mock <IDateTimeProvider>();
            var dateFormat             = "yyyy-MM-dd HH:mm";
            var dateNow = DateTime.UtcNow;

            // we are using mocked IDateTimeProvider to make sure we are refering to same "now"
            mockedDateTimeProvider.Setup(p => p.GetNow()).Returns(dateNow);
            var parser = new JwtParser(mockedDateTimeProvider.Object);
            var dateNowFutureString = dateNow.AddDays(parser.GetExpiredDays()).ToString(dateFormat);

            AcquireTokenModel tokenModel       = parser.AcquireToken("*****@*****.**", 1);
            VerifyResultModel result           = parser.Verify(tokenModel.Token);
            string            expiryDateString = null;

            if (result.ExpiryDate != null)
            {
                expiryDateString = result.ExpiryDate.Value.ToString(dateFormat);
            }

            Assert.Equal(dateNowFutureString, expiryDateString);
        }