Kotlin test DSL

nested-override-logic.kt

inline fun overrideBox(
  id: Long, 
  buildBox: BoxTestDataBuilder.() -> Unit
) {
  if (!boxIdExists(id)) {
    throw IllegalArgumentException("Box with id $id does not exist")
  }
  val boxBuilder = BoxTestDataBuilder()
  val existingBox = getBox(id)
  boxBuilder.merge(existingBox)
  boxBuilder.buildBox()
  removeBoxes(id)
  addBox(boxBuilder.build())
}
fun boxIdExists(boxId: Long): Boolean {
  return this.boxes.find { it.id == boxId } != null
}
fun getBox(boxId: Long): Box {
  return this.boxes.find { it.id == boxId }!!
}
fun removeBox(boxId: Long) {
  val mutableBoxes = this.boxes.toMutableList()
  mutableBoxes.removeIf { it.id == boxId }
  this.boxes = mutableBoxes.toList()
}
// Merge function inside the box test data builder
class BoxTestDataBuilder(
  var id: Long = 1L,
   var contents: List<Product> = emptyList()
) {
//... 
  fun merge(box: Box): BoxTestDataBuilder {
    this.id = box.id
    this.contents = box.contents
    return this
  }
//...
}