GaussKrondorTests.cs

using System;
using System.Collections.Generic;
using System.Text;
using static МатКлассы.FuncMethods.DefInteg.GaussKronrod;
using NUnit.Framework;

namespace MathClassesTests
{
    public class GaussKrondorTests
    {
        [TestCase(0,1)]
        [TestCase(5, 16)]
        [TestCase(-1,-0.3)]
        public void IntegralofX2(double begin,double end)
        {
            Func<double, double> x3 = (double x) => x * x * x / 3;
            
            double result = MySimpleGaussKronrod((double x) => x * x, begin, end);

            Assert.AreEqual(x3(end) - x3(begin),result,  0.000001);
        }

        [TestCase(0, 100)]
        [TestCase(5, 306)]
        [TestCase(-Math.PI, Math.PI*200)]
        public void IntegralofSinOnLongCut(double begin, double end)
        { 
            double result = MySimpleGaussKronrod(Math.Sin, begin, end,ChooseStepByCompareRes:true,MaxDivCount:6);

            Assert.AreEqual( -Math.Cos(end) + Math.Cos(begin), result,0.000001);
        }

        [TestCase(100,1,4,15)]
        [TestCase(100, 1, 4, 21)]
        [TestCase(100, 1, 4, 31)]
        [TestCase(100, 1, 4, 41)]
        [TestCase(100, 1, 4, 61)]
        [TestCase(10, 1, 4, 31)]
        [TestCase(-1.2002, -1, 4, 41)]
        [TestCase(100, 1, 4, 15)]
        [TestCase(1, -5, 4, 21)]
        [TestCase(70, 1, 45, 31)]
        public void SuperSin(double p,double begin,double end,int n)
        {
            Func<double, double> g = (double x) => -x / p * Math.Cos(p * x) + (1 / p) * (1 / p) * Math.Sin(p * x);


            double result= MySimpleGaussKronrod(x=>x*Math.Sin(x*p), begin, end, ChooseStepByCompareRes: true, MaxDivCount: 6, n:n);

            Assert.AreEqual(g(end) - g(begin), result, 0.00001);
        }
    }
}