using AfterHours.Economy;
using NUnit.Framework;

namespace AfterHours.Tests
{
    public sealed class PurchaseOrderTests
    {
        [Test]
        public void Total_SumsAllLines()
        {
            var order = new PurchaseOrder();
            order.Add(1, 10, 2f);
            order.Add(2, 5, 4f);

            Assert.AreEqual(40f, order.Total(), 0.0001f);
        }

        [Test]
        public void Add_IgnoresNonPositiveQuantity()
        {
            var order = new PurchaseOrder();
            order.Add(1, 0, 5f);
            order.Add(1, -3, 5f);

            Assert.AreEqual(0, order.Lines.Count);
        }

        [Test]
        public void LineTotal_IsQuantityTimesUnitPrice()
        {
            var order = new PurchaseOrder();
            order.Add(7, 3, 2.5f);

            Assert.AreEqual(7.5f, order.Lines[0].LineTotal, 0.0001f);
        }
    }
}