diff --git a/json/src/spec/authority_round.rs b/json/src/spec/authority_round.rs
index 83e029c56..ae518eebc 100644
--- a/json/src/spec/authority_round.rs
+++ b/json/src/spec/authority_round.rs
@@ -62,7 +62,10 @@ pub struct AuthorityRound {
 mod tests {
 	use uint::Uint;
 	use util::U256;
+	use util::H160;
 	use serde_json;
+	use hash::Address;
+	use spec::validator_set::ValidatorSet;
 	use spec::authority_round::AuthorityRound;
 
 	#[test]
@@ -84,5 +87,10 @@ mod tests {
 		let deserialized: AuthorityRound = serde_json::from_str(s).unwrap();
 		assert_eq!(deserialized.params.gas_limit_bound_divisor, Uint(U256::from(0x0400)));
 		assert_eq!(deserialized.params.step_duration, Uint(U256::from(0x02)));
+		assert_eq!(deserialized.params.validators, ValidatorSet::List(vec![Address(H160::from("0xc6d9d2cd449a754c494264e1809c50e34d64562b"))]));
+		assert_eq!(deserialized.params.block_reward, Some(Uint(U256::from(0x50))));
+		assert!(deserialized.params.registrar.is_none());
+		assert_eq!(deserialized.params.start_step, Some(Uint(U256::from(24))));
+		assert_eq!(deserialized.params.eip155_transition, Some(Uint(U256::from(0x42))));
 	}
 }