Kotlin test DSL

shipment-builder.kt

fun buildShipment(
  buildShipment: ShipmentTestDataBuilder.() -> Unit
): Shipment {
  val shipmentBuilder = ShipmentTestDataBuilder()
  shipmentBuilder.buildShipment()
  return shipmentBuilder.build()
}
class ShipmentTestDataBuilder(
 var id: Long = 1L,
 var boxes: List<Box> = emptyList()
) {
  // This is the builder for the nested boxes
  inline fun buildBoxes(buildBoxes: BoxTestDataBuilder.() -> Unit) {
    val boxBuilder = BoxTestDataBuilder()
    boxBuilder.buildBoxes()
		
    addBox(boxBuilder.build())
   }
   
  fun addBox(box: Box) {
    this.boxes = listOf(box) + boxes
  }
  fun build(): Shipment {
    return Shipment(
      id = id,
      boxes = boxes
    )
  }
}