Implement fuzzcheck targets for gossip messages

Fixes: #6

Cargo.toml

@@ -12,3 +12,7 @@ hex = "0.4.3"
 binprot = { version = "0.1.7" }
 binprot_derive = { version = "0.1.7" }
 thiserror = "1.0.32"
+
+[target.'cfg(fuzzing)'.dev-dependencies]
+#[dev-dependencies]
+fuzzcheck = "0.12.1"

tests/read-fuzz.rs

@@ -0,0 +1,43 @@
+#![cfg(all(test, fuzzing))]
+
+fn try_decode<T>(mut buf: &[u8]) -> bool
+where
+    T: binprot::BinProtRead,
+{
+    match T::binprot_read(&mut buf) {
+        Ok(_) => {}
+        Err(_) => {}
+    }
+    true
+}
+
+fn fuzz<F>(f: F)
+where
+    F: Fn(&[u8]) -> bool + 'static,
+{
+    let result = fuzzcheck::fuzz_test(f)
+        .default_options()
+        .stop_after_first_test_failure(true)
+        .launch();
+    assert!(!result.found_test_failure);
+}
+
+#[test]
+fn gossip_message() {
+    fuzz(try_decode::<mina_p2p_messages::GossipNetMessage>);
+}
+
+#[test]
+fn external_transition() {
+    fuzz(try_decode::<mina_p2p_messages::p2p::MinaBlockExternalTransitionRawVersionedStable>);
+}
+
+#[test]
+fn snark_pool_diff() {
+    fuzz(try_decode::<mina_p2p_messages::p2p::NetworkPoolSnarkPoolDiffVersionedStable>);
+}
+
+#[test]
+fn tx_pool_diff() {
+    fuzz(try_decode::<mina_p2p_messages::p2p::NetworkPoolTransactionPoolDiffVersionedStable>);
+}