public async Task TestSendSmsToAddressAsync()
        {
            SmsMessageV1 message = new SmsMessageV1()
            {
                To   = "+15203452335",
                Text = "{{text}}"
            };

            var parameters = ConfigParams.FromTuples(
                "subject", "Test Sms To Address",
                "text", "This is just a test"
                );

            await this._client.SendMessageAsync(null, message, parameters);

            Assert.True(!this._client.SendMessageAsync(null, message, parameters).IsFaulted);
        }
        public async Task TestSendSmsToRecipientsAsync()
        {
            SmsMessageV1 message = new SmsMessageV1()
            {
                Text = "This is just a test"
            };

            SmsRecipientV1 recipient = new SmsRecipientV1()
            {
                Id    = "1",
                Phone = "+152023452335",
                Name  = "Test Recipient"
            };

            await this._client.SendMessageToRecipientAsync(null, recipient, message, null);

            Assert.True(!this._client.SendMessageToRecipientAsync(null, recipient, message, null).IsFaulted);
        }