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

^KT-61259

native/native.tests/testData/codegen/inline/defaultArgs.kt

@@ -3,17 +3,19 @@
  * that can be found in the LICENSE file.
  */
 
-package codegen.inline.defaultArgs
-
 import kotlin.test.*
 
+val sb = StringBuilder()
+
 class Z
 
 inline fun Z.foo(x: Int = 42, y: Int = x) {
-    println(y)
+    sb.appendLine(y)
 }
 
-@Test fun runTest() {
+fun box(): String {
     val z = Z()
     z.foo()
+    assertEquals("42\n", sb.toString())
+    return "OK"
 }