This is a pretty barebones fuzzing setup for MiniJinja. Right now there are two things which can be fuzzed: rendering and adding templates to the environment (parse + compile).

For this to work you need to have cargo-fuzz installed:

$ cargo install cargo-fuzz

To run the fuzzers one of the following two commands can be used:

$ make fuzz-add-template
$ make fuzz-render

The render fuzzer is slightly more tricky to work with as part of what it's fuzzing is input to the template render function. The template adding fuzzer upon crashing will dump the input as raw text into the artifacts directory which makes it trivial to understand what is going on.

To repro a crash to iterate on it, use make repro with the right crash file:

$ make repro ARTIFACT=artifacts/render/crash-XXXX