using Xunit;
using System;
using System.IO;

namespace ConsoleApp
{
    public class ProgramTests
    {
        [Fact(DisplayName = "Main prints 'Access limited' for age between 13 and 17")]
        public void Main_PrintsAccessLimited()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            // Установим возраст между 13 и 17 внутри Main (например, 15)
            Program.TestMain(new string[0]);

            string output = sw.ToString();
            Assert.Contains("Access limited", output);

            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
    }
}

ProgramTests.cs

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Challenge: if Condition

Solution