diff --git a/tests/lib.yard b/tests/lib.yard
new file mode 100644
index 0000000..a286d6a
--- /dev/null
+++ b/tests/lib.yard
@@ -0,0 +1,5 @@
+
+foo( {
+    
+    println("say Hello!");
+}
\ No newline at end of file
diff --git a/tests/program.yard b/tests/program.yard
index c46be2d..3b9ba9e 100644
--- a/tests/program.yard
+++ b/tests/program.yard
@@ -2,6 +2,8 @@
 @version(100)
 @author(Sven Vogel)
 
+@include(/home/servostar/Projects/Yard/tests/lib.yard)
+
 max(a:int, b:int)=int {
     despite a < b {
         yield a
@@ -10,9 +12,11 @@ max(a:int, b:int)=int {
 }
 
 # main function
-main = int {
+main() = int {
 
     println("" .. max(3,4));
 
+    foo()
+
     0
 }