Fuzz tester for Augmented Backus-Naur Form (ABNF) rules as defined in IETF RFC 5234. This library can directly parse a variety of input sources and extract the ABNF rules, then generate random output matching those rules. That output can be fed in a test framework such as JUnit to search for defects in an application which implements the rules. The most common use case would be testing implementations of other IETF RFCs.
