using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnitTestSharp;
using Core.Substances;

namespace CoreTests.Substances
{
    public class SubstanceTest : TestFixture
    {
        public void TestSubtractsProper()
        {
            Substance a = 10;
            Substance b = 5;

            Substance amb = 5;
            Substance bma = 0;

            CheckEqual(a - b, amb);
            CheckEqual(b - a, bma);

            a = -10;
            b = -5;

            amb = 0;
            bma = 5;

            CheckEqual(a - b, amb);
            CheckEqual(b - a, bma);

            a = 10;
            b = -5;

            amb = 15;
            bma = 0;

            CheckEqual(a - b, amb);
            CheckEqual(b - a, bma);
        }

        public void TestAddsProper()
        {
            Substance a = 10;
            Substance b = 5;

            Substance apb = 15;
            Substance bpa = 15;

            CheckEqual(a + b, apb);
            CheckEqual(b + a, bpa);

            a = -10;
            b = -5;

            apb = 0;
            bpa = 0;

            CheckEqual(a + b, apb);
            CheckEqual(b + a, bpa);

            a = 10;
            b = -5;

            apb = 5;
            bpa = 5;

            CheckEqual(a + b, apb);
            CheckEqual(b + a, bpa);
        }

        public void TestNeverEstimatesAndMultipliesProper()
        {
            CheckFalse(1.1 * 0.1 == 0.11);
            Substance a = new Substance(new Decimal(1.1));
            Substance b = new Substance(new Decimal(0.1));
            Substance c = new Substance(new Decimal(0.11));
            CheckTrue(a * b == c);
            CheckTrue(b * a == c);
        }
    }
}