diff --git a/test/test.c b/test/test.c
index 4cce7f6..e9a0a23 100644
--- a/test/test.c
+++ b/test/test.c
@@ -1,3 +1,6 @@
+#include <stdio.h>
+
 int main() {
+  printf("all ok\n");
   return 0;
 }
diff --git a/test/test.cpp b/test/test.cpp
index 4cce7f6..c36cbb6 100644
--- a/test/test.cpp
+++ b/test/test.cpp
@@ -1,3 +1,6 @@
+#include <iostream>
+
 int main() {
+  std::cout << "all ok" << std::endl;
   return 0;
 }