diff --git a/src/evm/factory.rs b/src/evm/factory.rs
index b1cb012a6..25a41afd2 100644
--- a/src/evm/factory.rs
+++ b/src/evm/factory.rs
@@ -1,11 +1,31 @@
 //! Evm factory.
-
+use std::fmt;
 use evm::Evm;
 
+#[derive(Clone)]
 pub enum VMType {
 	Jit,
 	Interpreter
 }
+impl fmt::Display for VMType {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+		write!(f, "{}", match *self {
+			VMType::Jit => "JIT",
+			VMType::Interpreter => "INT"
+		})
+	}
+}
+
+impl VMType {
+	#[cfg(feature="jit")]
+	pub fn all() -> Vec<VMType> {
+		vec![VMType::Jit, VMType::Interpreter]
+	}
+	#[cfg(not(feature="jit"))]
+	pub fn all() -> Vec<VMType> {
+		vec![VMType::Interpreter]
+	}
+}
 
 /// Evm factory. Creates appropriate Evm.
 pub struct Factory {
diff --git a/src/tests/executive.rs b/src/tests/executive.rs
index 3f4175b52..609ac5f03 100644
--- a/src/tests/executive.rs
+++ b/src/tests/executive.rs
@@ -156,16 +156,28 @@ impl<'a> Ext for TestExt<'a> {
 }
 
 fn do_json_test(json_data: &[u8]) -> Vec<String> {
+	let vms = VMType::all();
+	
+	vms
+		.iter()
+		.flat_map(|vm| do_json_test_for(vm, json_data))
+		.collect()
+}
+
+fn do_json_test_for(vm: &VMType, json_data: &[u8]) -> Vec<String> {
 	let json = Json::from_str(::std::str::from_utf8(json_data).unwrap()).expect("Json is invalid");
 	let mut failed = Vec::new();
 	for (name, test) in json.as_object().unwrap() {
 		// sync io is usefull when something crashes in jit
-		//::std::io::stdout().write(&name.as_bytes());
-		//::std::io::stdout().write(b"\n");
-		//::std::io::stdout().flush();
+		// ::std::io::stdout().write(&name.as_bytes());
+		// ::std::io::stdout().write(b"\n");
+		// ::std::io::stdout().flush();
 		let mut fail = false;
 		//let mut fail_unless = |cond: bool| if !cond && !fail { failed.push(name.to_string()); fail = true };
-		let mut fail_unless = |cond: bool, s: &str | if !cond && !fail { failed.push(name.to_string() + ": "+ s); fail = true };
+		let mut fail_unless = |cond: bool, s: &str | if !cond && !fail { 
+			failed.push(format!("[{}] {}: {}", vm, name.to_string(), s)); 
+			fail = true 
+		};
 	
 		// test env
 		let mut state = State::new_temp();
@@ -197,7 +209,7 @@ fn do_json_test(json_data: &[u8]) -> Vec<String> {
 			info.timestamp = u256_from_json(&env["currentTimestamp"]).low_u64();
 		});
 
-		let engine = TestEngine::new(0, VMType::Jit);
+		let engine = TestEngine::new(0, vm.clone());
 
 		// params
 		let mut params = ActionParams::new();
@@ -222,7 +234,7 @@ fn do_json_test(json_data: &[u8]) -> Vec<String> {
 		let (res, callcreates) = {
 			let ex = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate, OutputPolicy::Return(BytesRef::Flexible(&mut output)));
 			let mut test_ext = TestExt::new(ex);
-			let evm = Factory::default().create();
+			let evm = engine.vm_factory().create();
 			let res = evm.exec(&params, &mut test_ext);
 			(res, test_ext.callcreates)
 		};