[K/N][Tests] Adjust moved codegen tests to new infra

^KT-61259

native/native.tests/testData/codegen/enum/test0.kt

@@ -3,8 +3,6 @@
  * that can be found in the LICENSE file.
  */
 
-package codegen.enum.test0
-
 import kotlin.test.*
 
 val TOP_LEVEL = 5
@@ -13,6 +11,8 @@ enum class MyEnum(value: Int) {
     VALUE(TOP_LEVEL)
 }
 
-@Test fun runTest() {
-    println(MyEnum.VALUE.toString())
+fun box(): String {
+    assertEquals("VALUE", MyEnum.VALUE.toString())
+
+    return "OK"
 }