diff --git a/test/test_inputHandling.c b/test/test_inputHandling.c
index 0c16125..ee9fa90 100644
--- a/test/test_inputHandling.c
+++ b/test/test_inputHandling.c
@@ -40,4 +40,11 @@ void test_inputHandling_deleteAllOtherCharacter(void)
     TEST_ASSERT_EQUAL_STRING("HalloWelt", halloWelt4);
 }
 
+void test_inputHandling_findAddFunctionType(void)
+{
+    op type = opNotSupported;
+    type = detectFunctionOperator("4+5", 3);
+    TEST_ASSERT_TRUE(opAdd == type);
+}
+
 #endif // TEST