(testing by trying a lot of random stuff)
Cjdns has a few fuzz tests, at the time of this writing these include FramingIface_fuzz_test and CryptoAuth_fuzz_test.
The standard when developing a fuzz test is to name it WhateverBlah_fuzz_test.c
Fuzz tests are configured by default to run for only a few milliseconds on a fast machine so that they do not take an extraordinary amount of time on a small device.
To run a fuzz test for longer, you should pass the parameter --fuzz in the command line when
running the test executable.
For example:
./build_linux/test_testcjdroute_c CryptoAuth_fuzz_test --fuzz
This will run the test a number of cycles which corresponds to about 10 seconds of testing on a fast machine (mine). You can expect a line like the following to be printed at the end:
1445844036 DEBUG CryptoAuth_fuzz_test.c:333 ===+++=== Completed Ok ===++++===