lez-fuzzing/fuzz/fuzz_targets/fuzz_transaction_decoding.rs

#![cfg_attr(feature = "fuzzer-libfuzzer", no_main)]

use common::{
    block::{Block, HashableBlockData},
    transaction::LeeTransaction,
};

fuzz_props::fuzz_entry!(|data: &[u8]| {
    // Attempt 1: decode as LeeTransaction and verify roundtrip
    if let Ok(tx) = borsh::from_slice::<LeeTransaction>(data) {
        let re_encoded = borsh::to_vec(&tx).expect("re-encode of valid tx must succeed");
        let tx2 = borsh::from_slice::<LeeTransaction>(&re_encoded)
            .expect("second decode of re-encoded tx must succeed");
        assert_eq!(
            re_encoded,
            borsh::to_vec(&tx2).unwrap(),
            "LeeTransaction roundtrip encoding divergence"
        );
    }

    // Attempt 2: decode as Block — must never panic
    let _ = borsh::from_slice::<Block>(data);

    // Attempt 3: decode as HashableBlockData — must never panic
    let _ = borsh::from_slice::<HashableBlockData>(data);
});