Add tests for recieving inbound USSD message from TruTeq.
Add tests for recieving inbound USSD message from TruTeq.

harrissoerja/vumi,vishwaprakashmishra/xmatrix,harrissoerja/vumi,vishwaprakashmishra/xmatrix,vishwaprakashmishra/xmatrix,TouK/vumi,TouK/vumi,harrissoerja/vumi,TouK/vumi