added baisc test code

tests/wrap/test_wrap.c

@@ -0,0 +1,18 @@
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <setjmp.h>
+#include <cmocka.h>
+ 
+/* A test case that does nothing and succeeds. */
+static void null_test_success(void **state) {
+    (void) state; /* unused */
+}
+ 
+int main(void)
+{
+    const struct CMUnitTest tests[] = {
+        cmocka_unit_test(null_test_success),
+    }; 
+    return cmocka_run_group_tests(tests, NULL, NULL);
+}