diff --git a/tools/test/interface_mock.hpp b/tools/test/interface_mock.hpp
new file mode 100644
index 0000000..4b3aeec
--- /dev/null
+++ b/tools/test/interface_mock.hpp
@@ -0,0 +1,10 @@
+#pragma once
+
+#include "interface.hpp"
+
+class MockData : public DataInterface
+{
+  public:
+    MOCK_METHOD2(SendData, void(std::FILE*, int));
+    MOCK_METHOD0(External, bool());
+};