diff --git a/res/validator/tester.py b/res/validator/tester.py
new file mode 100644
index 0000000..f360b80
--- /dev/null
+++ b/res/validator/tester.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+
+
+# ------------------------------------------------------------------------------
+
+class Tester:
+    def __init__(self, interface):
+        self.interface  = interface
+        self.sent       = None
+        self.expected   = None
+        self.received   = None
+
+    def handleMidiInput(self, data):
+        print('Recived data:', data)
+        self.received = data
+
+    def checkThru(self, message):
+        self.interface.send(message)
+        self.sent     = message
+        self.expected = message
+        self.received = None
+        while not self.received:
+            pass
+        return self.expected == self.received