unit test introduced:

User should create <test-name>-test.c file in the following manner:
> cat codegen/function/sum-test.c
extern void *resolve_symbol(const char*);

int
run_test() {
  int (*sum)(int, int) = resolve_symbol("kfun:sum");

  if (sum(2, 3) != 5) return 1;

  return 0;
}
and add <test-name> to the TESTS variable in the Makefile
to run tests:
> make clean run
Note: failing tests should return no zero values.

backend.native/tests/main.c

@@ -0,0 +1,19 @@
+#include <dlfcn.h>
+#include <stdio.h>
+/**
+ * > llc-mp-3.8 b.out -o b.S
+ * > /opt/local/libexec/llvm-3.8/bin/clang main.c b.S -o sum-test
+ */
+
+extern int run_test();
+
+void * resolve_symbol(char *name) {
+  /* here we can add here some magic to resolve symbols in kotlin native*/
+  return dlsym(RTLD_SELF, name);
+}
+    
+
+int
+main() {
+  return run_test();
+}