feat: add contract testing without nodes (#685)

* implement contract sign() with yield/resume

* fix: lcoal state clearing not successful, and refactor signature_responded to return Error types instead of anyhow

* clippy

* Added contract testing without node setup

* Some cleanup

* Updated tests with more cases

* Updated contract to have threshold check for init

* Fix fmt, clippy

---------

Co-authored-by: Xiangyi Zheng <xiangyi@near.org>

chain-signatures/contract/Cargo.toml

@@ -17,6 +17,15 @@ crypto-shared = { path = "../crypto-shared" }
 near-gas = { version = "0.2.5", features = ["serde", "borsh", "schemars"] }
 
 [dev-dependencies]
-near-workspaces = { git = "https://github.com/near/near-workspaces-rs", branch = "node/1.40" }
+anyhow = "1"
+rand = "0.8"
 tokio = { version = "1", features = ["full"] }
-anyhow = "1.0.44"
+
+# crypto dependencies
+ecdsa = { version = "0.16.9", features = ["digest", "hazmat"] }
+signature = "2.2.0"
+digest = "0.10.7"
+
+# near dependencies
+near-crypto = "0.23.0"
+near-workspaces = { git = "https://github.com/near/near-workspaces-rs", branch = "node/1.40" }

chain-signatures/contract/src/lib.rs

@@ -616,12 +616,16 @@ impl VersionedMpcContract {
     #[init]
     pub fn init(threshold: usize, candidates: BTreeMap<AccountId, CandidateInfo>) -> Self {
         log!(
-            "init: signer={}, treshhold={}, candidates={}",
+            "init: signer={}, threshold={}, candidates={}",
             env::signer_account_id(),
             threshold,
             serde_json::to_string(&candidates).unwrap()
         );
 
+        if threshold > candidates.len() {
+            env::panic_str("threshold cannot be greater than the number of candidates");
+        }
+
         Self::V0(MpcContract::init(threshold, candidates))
     }
 
@@ -643,6 +647,10 @@ impl VersionedMpcContract {
             public_key
         );
 
+        if threshold > participants.len() {
+            env::panic_str("threshold cannot be greater than the number of participants");
+        }
+
         Self::V0(MpcContract {
             protocol_state: ProtocolContractState::Running(RunningContractState {
                 epoch,