all the refactor

pkg/promotions/eval_test.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"git.k6n.net/mats/go-cart-actor/pkg/cart"
+	"git.k6n.net/mats/platform/money"
 )
 
 // --- Helpers ---------------------------------------------------------------
@@ -63,13 +64,13 @@ func makeCart(totalOverride int64, items []struct {
 }) *cart.CartGrain {
 	g := cart.NewCartGrain(1, time.Now())
 	for _, it := range items {
-		p := cart.NewPriceFromIncVat(it.priceInc, 0.25)
+		p := cart.NewPriceFromIncVat(it.priceInc, 2500) // 25% in basis points
 		g.Items = append(g.Items, &cart.CartItem{
 			Id:    uint32(len(g.Items) + 1),
 			Sku:   it.sku,
 			Price: *p,
 			TotalPrice: cart.Price{
-				IncVat:   p.IncVat * int64(it.qty),
+				IncVat:   p.IncVat.Mul(int64(it.qty)),
 				VatRates: p.VatRates,
 			},
 			Quantity: it.qty,
@@ -81,7 +82,7 @@ func makeCart(totalOverride int64, items []struct {
 	// Recalculate totals
 	g.UpdateTotals()
 	if totalOverride >= 0 {
-		g.TotalPrice.IncVat = totalOverride
+		g.TotalPrice.IncVat = money.Cents(totalOverride)
 	}
 	return g
 }