spandsp: ADSI tests

spandsp 0.0.6

ADSI tests

# What does it do?

These tests exercise the ADSI module, for all supported standards. A transmit and a receive instance of the ADSI module are connected together. A quantity of messages is passed between these instances, and checked for accuracy at the receiver. Since the FSK modems used for this are exercised fully by other tests, these tests do not include line modelling.

# How does it work?