pub fn add_hash_fn_edge_cases(corpus: &mut Vec<Vec<u8>>) {
    let max_len = DEFAULT_CORPUS_COUNT;
    corpus.push(vec![]);

    // push inputs of all 0s
    for len in 1..=max_len {
        corpus.push(vec![0; len as usize]);
    }

    // push inputs of all 255s
    for len in 1..=max_len {
        corpus.push(vec![255; len as usize]);
    }
}
Append common edge cases to the corpus.

Like all 0s or all 1s or the empty string.
patch-testing/sp1-test/src/lib.rs