TEST: convertion unit tests into run tests

backend.native/tests/codegen/function/sum_3const.kt

@@ -1,2 +1,6 @@
 fun sum3():Int = sum(1, 2, 33)
 fun sum(a:Int, b:Int, c:Int): Int = a + b + c
+
+fun main(args: Array<String>) {
+    if (sum3() != 36) throw Error()
+}