Add poseidon-lengths test

poseidon-lengths/rs/.gitignore

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+/target
+Cargo.lock

poseidon-lengths/rs/Cargo.toml

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+[package]
+name = "rs"
+version = "0.0.1"
+authors = ["arnaucube <root@arnaucube.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+poseidon-rs = "0.0.2"
+rustc-hex = "1.0.0"

poseidon-lengths/rs/src/lib.rs

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+#[cfg(test)]
+mod tests {
+    use poseidon_rs::Poseidon;
+    use rustc_hex::ToHex;
+
+    #[test]
+    fn test_output_size() {
+        let poseidon = Poseidon::new();
+        let msg = "45";
+        let h = poseidon.hash_bytes(msg.as_bytes().to_vec()).unwrap();
+        println!("bigint {:?}", h.to_string());
+        println!("length {:?}", h.to_bytes_be().1.len());
+        println!("bytes {:?}", h.to_bytes_be().1);
+        assert_eq!(h.to_bytes_be().1.len(), 31);
+        println!("hex {:?}", h.to_bytes_be().1.to_hex());
+    }
+}