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

^KT-61259

native/native.tests/testData/codegen/basics/concatenation.kt

@@ -2,18 +2,19 @@
  * 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 codegen.basics.concatenation
+// OUTPUT_DATA_FILE: concatenation.out
 
 import kotlin.test.*
 
-@Test
-fun runTest() {
+fun box(): String {
     val s = "world"
     val i = 1
-    println("Hello $s $i ${2*i}")
+    val res1 = "Hello $s $i ${2 * i}"
+    if (res1 != "Hello world 1 2") return "FAIL 1: $res1"
 
-    for (item in listOf("a", "b")) {
-        println("Hello, $item")
-    }
+    val a = "a"
+    val res2 = "Hello, $a"
+    if (res2 != "Hello, a") return "FAIL 2: $res2"
+
+    return "OK"
 }