diff --git a/tests/functions.c b/tests/functions.c
new file mode 100644
index 0000000..ee37205
--- /dev/null
+++ b/tests/functions.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+int add(int x, int y);
+int main(void);
+
+
+int add(int x, int y) {
+    return (x + y);
+}
+
+int main(void) {
+    int sum = add(5, 3);
+    struct T id = identity(42);
+    return sum;
+}
+
diff --git a/tests/structs.c b/tests/structs.c
index d2a2577..e8915e2 100644
--- a/tests/structs.c
+++ b/tests/structs.c
@@ -2,12 +2,10 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <string.h>
-
 struct Point {
     int x;
     int y;
 };
-
 int main(void);
 
 
diff --git a/tests/traits.c b/tests/traits.c
index 8cb9442..a4a89b8 100644
--- a/tests/traits.c
+++ b/tests/traits.c
@@ -1,19 +1,21 @@
-#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdbool.h>
 #include <string.h>
-
 struct Number {
-  int value;
+    int value;
 };
-
-char *Number_show(struct Number self);
+char* Number_show(struct Number self);
 int main(void);
 
-char *Number_show(struct Number self) { return "number"; }
+
+char* Number_show(struct Number self) {
+    return "number";
+}
 
 int main(void) {
-  struct Number number = (struct Number){.value = 40};
-  Number_show(number);
-  return 0;
+    struct Number number = (struct Number){ .value = 40 };
+    Number_show(number);
+    return 0;
 }
+