test(rln): Add passing semaphore test

rln/src/lib.rs

@@ -46,6 +46,39 @@ mod test {
         println!("Merkle proof: {:#?}", merkle_proof);
     }
 
+    #[test]
+    fn test_semaphore() {
+        const LEAF: Hash = Hash::from_bytes_be(hex!(
+            "0000000000000000000000000000000000000000000000000000000000000000"
+        ));
+
+        // generate identity
+        let id = Identity::new(b"hello");
+
+        // generate merkle tree
+        let mut tree = PoseidonTree::new(21, LEAF);
+        tree.set(0, id.commitment().into());
+
+        let merkle_proof = tree.proof(0).expect("proof should exist");
+        let root = tree.root().into();
+
+        // change signal and external_nullifier here
+        let signal = b"xxx";
+        let external_nullifier = b"appId";
+
+        let external_nullifier_hash = semaphore::protocol::hash_external_nullifier(external_nullifier);
+        let nullifier_hash = semaphore::protocol::generate_nullifier_hash(&id, external_nullifier_hash);
+
+        let proof = semaphore::protocol::generate_proof(&id, &merkle_proof, external_nullifier, signal).unwrap();
+
+        let success =
+            semaphore::protocol::verify_proof(root, nullifier_hash, signal, external_nullifier, &proof).unwrap();
+
+        assert!(success);
+    }
+
+
+
     #[ignore]
     #[test]
     fn test_end_to_end() {