Stuff that is done to find Privoxy bugs before they affect the users

- Static code analysis
- Code review of new and existing code
- Privoxy-Regression-Test (executes mostly Privoxy-specific tests)
- Curl's test suite (Currently 267 HTTP tests)
- Valgrind
- Fuzzing (zzuf, proxyfuzz, "internal" fuzzers, afl-fuzz)
- Manual testing

As a result, Privoxy can be considered moderately well tested.
Most bugs are found "internally", not always before the
release, though.