Fuzz unit tests

[Stentonian]

There are some unit tests that could use with some fuzzing because they test code that uses a RNG. Here is a non-exhaustive list:

• https://github.com/silversixpence-crypto/dapol/blob/89ecbcab22f370975fd0c693f97cd88b9c965a8d/src/accumulators/ndm_smt.rs#L184
• https://github.com/silversixpence-crypto/dapol/blob/89ecbcab22f370975fd0c693f97cd88b9c965a8d/src/node_content/full_node.rs#L149
• https://github.com/silversixpence-crypto/dapol/blob/89ecbcab22f370975fd0c693f97cd88b9c965a8d/src/node_content/compressed_node.rs#L127

Here are some resources to help:

• https://fuzzinglabs.com/introduction-rust-fuzzing-tutorial/
• https://lib.rs/crates/test-fuzz
• https://blog.logrocket.com/how-to-organize-rust-tests/
• https://github.com/rust-fuzz
• https://rustc-dev-guide.rust-lang.org/fuzzing.html

[Stentonian]

Going to use cargo-fuzz

https://rust-fuzz.github.io/book/cargo-fuzz.html

[Stentonian]

Added a fuzz test here: https://github.com/silversixpence-crypto/dapol/pull/141/commits/e75672be04554c82c09e629ef7f74a27b241e877

Can use the framework to do more fuzz tests. They are rather different to unit tests so should be used sparingly, and we should rather use one of these do test a range of input:

• https://docs.rs/quickcheck
• https://docs.rs/proptest

See here for advice on the above 2 libraries: https://blog.logrocket.com/how-to-organize-rust-tests/#use-fuzzing