diff --git a/json/src/spec/tendermint.rs b/json/src/spec/tendermint.rs
index 16c2d7255..5a15a0841 100644
--- a/json/src/spec/tendermint.rs
+++ b/json/src/spec/tendermint.rs
@@ -57,7 +57,12 @@ pub struct Tendermint {
 #[cfg(test)]
 mod tests {
 	use serde_json;
+	use uint::Uint;
+	use util::U256;
+	use hash::Address;
+	use util::hash::H160;
 	use spec::tendermint::Tendermint;
+	use spec::validator_set::ValidatorSet;
 
 	#[test]
 	fn tendermint_deserialization() {
@@ -71,6 +76,10 @@ mod tests {
 			}
 		}"#;
 
-		let _deserialized: Tendermint = serde_json::from_str(s).unwrap();
+		let deserialized: Tendermint = serde_json::from_str(s).unwrap();
+		assert_eq!(deserialized.params.gas_limit_bound_divisor, Uint(U256::from(0x0400)));
+		let vs = ValidatorSet::List(vec![Address(H160::from("0xc6d9d2cd449a754c494264e1809c50e34d64562b"))]);
+		assert_eq!(deserialized.params.validators, vs);
+		assert_eq!(deserialized.params.block_reward, Some(Uint(U256::from(0x50))));
 	}
 }