using Xunit;
using System;
using System.IO;

namespace ConsoleApp
{
    public class ProgramTests
    {
        [Theory(DisplayName = "Prints correct discount message based on age and membership")]
        [InlineData(70, false, "Eligible for discount")]
        [InlineData(65, false, "Eligible for discount")]
        [InlineData(30, true, "Eligible for discount")]
        public void Main_PrintsCorrectDiscountMessage(int age, bool isMember, string expectedOutput)
        {
            var originalOut = Console.Out;
            try
            {
                var sw = new StringWriter();
                Console.SetOut(sw);

                // Меняем значения напрямую в коде Main перед вызовом TestMain
                // Для настоящего проекта лучше делать метод, который принимает параметры
                Program.TestMain(new string[0]);

                var output = sw.ToString().Trim();
                Assert.Contains(expectedOutput, output);
            }
            finally
            {
                Console.SetOut(originalOut);
            }
        }
    }
}

ProgramTests.cs

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Challenge: else Keyword

Solution