[K/N][tests] Adjust moved tests to new testing infra

^KT-61259

native/native.tests/testData/codegen/initializers/initializers5.kt

@@ -2,9 +2,6 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
-package runtime.basic.initializers5
-
 import kotlin.test.*
 
 object A {
@@ -12,6 +9,8 @@ object A {
     val b = A.a
 }
 
-@Test fun runTest() {
-    println(A.b)
+fun box(): String {
+    assertEquals(42, A.b)
+
+    return "OK"
 }