tests: add a cargo-fuzz-powered fuzz test

Signed-off-by: ljedrz <[email protected]>

fuzz/.gitignore

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+target
+corpus
+artifacts
+Cargo.lock

fuzz/Cargo.toml

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+[package]
+name = "snarkos-fuzz"
+version = "0.0.0"
+authors = ["Automatically generated"]
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+bytes = "1"
+libfuzzer-sys = "0.4"
+tokio-util = { version = "0.7", features = [ "codec" ] }
+
+[dependencies.snarkos-environment]
+path = "../environment"
+features = [ "network" ]
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "fuzz_target_1"
+path = "fuzz_targets/fuzz_target_1.rs"
+test = false
+doc = false

fuzz/fuzz_targets/fuzz_target_1.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+
+use bytes::BytesMut;
+use snarkos_environment::{network::MessageCodec, Client, CurrentNetwork};
+use tokio_util::codec::Decoder;
+
+fuzz_target!(|messages: Vec<&[u8]>| {
+    let mut codec = MessageCodec::<CurrentNetwork, Client<CurrentNetwork>>::default();
+
+    for message in messages {
+        let mut bytes = BytesMut::from(message);
+        let _ = codec.decode(&mut bytes);
+    }
+});