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

^KT-61259

native/native.tests/testData/codegen/function/arithmetic.kt

@@ -3,20 +3,18 @@
  * that can be found in the LICENSE file.
  */
 
-package codegen.function.arithmetic
-
-import kotlin.test.*
-
 fun square(a:Int):Int = a * a
 fun sumOfSquares(a:Int, b:Int):Int = square(a) + square(b)
 fun diffOfSquares(a:Int, b:Int):Int = square(a) - square(b)
 fun mod(a:Int,b:Int):Int = a / b
 fun remainder(a:Int, b:Int):Int = a % b
 
-@Test fun runTest() {
+fun box(): String {
     if (square(2)             != 4)   throw Error()
     if (sumOfSquares(2, 4)    != 20)  throw Error()
     if (diffOfSquares(2, 4)   != -12) throw Error()
     if (mod(5, 2)             != 2)   throw Error()
     if (remainder(5, 2)       != 1)   throw Error()
+
+    return "OK"
 }