diff --git a/json-tests/src/trie.rs b/json-tests/src/trie.rs
index f6d4eaae1..827bf8c9a 100644
--- a/json-tests/src/trie.rs
+++ b/json-tests/src/trie.rs
@@ -4,7 +4,7 @@ use rustc_serialize::*;
 use rustc_serialize::hex::FromHex;
 use super::{JsonTest, JsonLoader};
 
-pub enum OperationType {
+enum OperationType {
 	Insert,
 	Remove
 }
@@ -26,10 +26,9 @@ struct RawOperation {
 	value: Option<String>
 }
 
-pub struct Operation {
-	pub operation: OperationType,
-	pub key: Vec<u8>,
-	pub value: Option<Vec<u8>>
+pub enum Operation {
+	Insert(Vec<u8>, Vec<u8>),
+	Remove(Vec<u8>)
 }
 
 fn hex_or_string(s: &str) -> Vec<u8> {
@@ -41,12 +40,9 @@ fn hex_or_string(s: &str) -> Vec<u8> {
 
 impl Into<Operation> for RawOperation {
 	fn into(self) -> Operation {
-		Operation {
-			operation: self.operation,
-			key: hex_or_string(&self.key),
-			value: self.value.map(|v| {
-				hex_or_string(&v)
-			})
+		match self.operation {
+			OperationType::Insert => Operation::Insert(hex_or_string(&self.key), hex_or_string(&self.value.unwrap())),
+			OperationType::Remove => Operation::Remove(hex_or_string(&self.key))
 		}
 	}
 }
@@ -96,9 +92,9 @@ impl JsonTest for TriehashTest {
 		self.trietest.input()
 			.into_iter()
 			.fold(HashMap::new(), | mut map, o | {
-				match o.operation {
-					OperationType::Insert => map.insert(o.key, o.value.unwrap()),
-					OperationType::Remove => map.remove(&o.key)
+				match o {
+					Operation::Insert(k, v) => map.insert(k, v),
+					Operation::Remove(k) => map.remove(&k)
 				};
 				map
 			})
diff --git a/src/trie.rs b/src/trie.rs
index 85312a58c..11e87c302 100644
--- a/src/trie.rs
+++ b/src/trie.rs
@@ -721,8 +721,11 @@ impl Trie for TrieDB {
 
 #[cfg(test)]
 mod tests {
+	extern crate json_tests;
+	use self::json_tests::*;
 	use rustc_serialize::hex::FromHex;
 	use triehash::*;
+	use hash::*;
 	use super::*;
 	use nibbleslice::*;
 	use rlp;
@@ -1061,4 +1064,22 @@ mod tests {
 
 		test_all(v);
 	}
+
+	#[test]
+	fn test_trie_json() {
+		println!("Json trie test: ");
+		execute_tests_from_directory::<trie::TrieTest, _>("json-tests/json/trie/*.json", &mut | file, input, output | {
+			println!("file: {}", file);
+
+			let mut t = TrieDB::new_memory();
+			for operation in input.into_iter() {
+				match operation {
+					trie::Operation::Insert(key, value) => t.insert(&key, &value),
+					trie::Operation::Remove(key) => t.remove(&key)
+				}
+			}
+
+			assert_eq!(*t.root(), H256::from_slice(&output));
+		});
+	}
 }
diff --git a/src/triehash.rs b/src/triehash.rs
index 6cfa2103d..93d21aacc 100644
--- a/src/triehash.rs
+++ b/src/triehash.rs
@@ -283,7 +283,7 @@ mod tests {
 	use triehash::*;
 
 	#[test]
-	fn test_trie_out_of_order() {
+	fn test_triehash_out_of_order() {
 		assert!(trie_root(vec![
 			(vec![0x01u8, 0x23], vec![0x01u8, 0x23]),
 			(vec![0x81u8, 0x23], vec![0x81u8, 0x23]),
@@ -297,7 +297,7 @@ mod tests {
 	}
 
 	#[test]
-	fn test_trie_json() {
+	fn test_triehash_json() {
 		execute_tests_from_directory::<trie::TriehashTest, _>("json-tests/json/trie/*.json", &mut | file, input, output | {
 			println!("file: {}, output: {:?}", file, output);
 			assert_eq!(trie_root(input), H256::from_slice(&output));