Hi Big fan of Kotest Thanks for this amazing library Newbie property testing question I m trying to compose an object with `Arb bind ` the object contains a list of other objects I m having trouble generating a list of objects to populate my main arb with Here s what I have ```class CartModelTest StringSpec create Cart from CartEntity val cartItemArb Arb lt CartLineItemEntity gt = Arb bind Arb string <http Arb int|Arb int> 1 999 randomItemId randomQuantity gt CartLineItemEntityBuilder itemId randomItemId quantity randomQuantity build val cartEntityArb Arb lt CartEntity gt = Arb bind Arb string Arb double <http Arb int|Arb int> randomId randomAmount randomItemCount gt val amount = AmountBuilder value randomAmount build CartEntityBuilder cartId randomId grandTotal amount subtotal amount totalDiscount amount numberOfItems randomItemCount TODO how do i create a random list of CartLineItems itemList listOf cartItemArb single build checkAll cartEntityArb cartEntity gt val result = Cart fromCartEntity cartEntity result workfile shouldBe cartEntity cartId ``` How do I populate itemList in my `cartEntityArb` with a list of `cartItemArbs`

class CartModelTest : StringSpec({
    "create Cart from CartEntity" {
        val cartItemArb: Arb<CartLineItemEntity> = Arb.bind(
            Arb.string(),
            <http://Arb.int|Arb.int>(1..999)
        ) { randomItemId, randomQuantity ->
            CartLineItemEntityBuilder()
                .itemId(randomItemId)
                .quantity(randomQuantity)
                .build()

        }
        val cartEntityArb: Arb<CartEntity> = Arb.bind(
            Arb.string(),
            Arb.double(),
            <http://Arb.int|Arb.int>()
        ) { randomId, randomAmount, randomItemCount ->
            val amount = AmountBuilder().value(randomAmount).build()
            CartEntityBuilder()
                .cartId(randomId)
                .grandTotal(amount)
                .subtotal(amount)
                .totalDiscount(amount)
                .numberOfItems(randomItemCount)
                    //TODO how do i create a random list of CartLineItems?
                .itemList(listOf(cartItemArb.single()))
                .build()
        }
        checkAll(cartEntityArb) { cartEntity ->
            val result = Cart.fromCartEntity(cartEntity)
            result.workfile shouldBe cartEntity.cartId
        }
    }
})

How do I populate itemList in my

cartEntityArb

with a list of

cartItemArbs

sam

01/08/2021, 3:15 AM

In your cart entity arb, make a fourth parameter by an Arb.list that itself uses your cart item arb

val cartEntityArb: Arb<CartEntity> = Arb.bind(
            Arb.string(),
            Arb.double(),
            Arb.list(cartItemArb, 1..10)
        ) { randomId, randomAmount, randomItems ->

nelson ramirez

01/08/2021, 3:23 AM

Awesome. that worked beautifully. Thank you! 🙌

🙂 1

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