package model

import (
	"encoding/json"
	"strings"
	"testing"

	"github.com/shopspring/decimal"
)

func TestStockJSONUsesTotalOnHandContract(t *testing.T) {
	payload, err := json.Marshal(Stock{TotalOnHand: decimal.RequireFromString("12.5")})
	if err != nil {
		t.Fatalf("marshal stock: %v", err)
	}

	jsonText := string(payload)
	if !strings.Contains(jsonText, `"total_on_hand":"12.5"`) {
		t.Fatalf("payload %s does not expose total_on_hand", jsonText)
	}
	if strings.Contains(jsonText, "current_stock") {
		t.Fatalf("payload %s still exposes legacy current_stock", jsonText)
	}
}