The API Cover works with signature files using it's own API instead using SigTest. We should use sigtest reader to realize this functionality. In this case we can be sure that it works as well as SignatureTest reader. Also this avoid code duplication and reduce the time of develpment and increase quality.
Also API Cover should use SigTest to read ConstatnPool to eliminate dependency from ClassInfo tool. This functionality is included in SigTest and it is not needed to use any other tools.