diff --git a/src/lib/test/main.c b/src/lib/test/main.c
index 9c5418d..68613a0 100644
--- a/src/lib/test/main.c
+++ b/src/lib/test/main.c
@@ -4,6 +4,11 @@
 
 #include <why2.h>
 
+int encryptionOperationTest(int text, int encryptedText)
+{
+    return text ^ encryptedText;
+}
+
 int main(void)
 {
     //VARIABLES