using Xunit;
using System;
using System.IO;

namespace ConsoleApp.Tests
{
    public class ProgramTests
    {
        [Fact(DisplayName = "ProcessNumbers prints correct numbers and total")]
        public void ProcessNumbers_PrintsExpectedOutput()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.ProcessNumbers();

            string output = sw.ToString();

            Assert.DoesNotContain("Number: 4", output);

            Assert.DoesNotContain("Number: 9", output);
            Assert.DoesNotContain("Number: 10", output);

            Assert.Contains("Number: 1", output);
            Assert.Contains("Number: 2", output);
            Assert.Contains("Number: 3", output);
            Assert.Contains("Number: 5", output);
            Assert.Contains("Number: 6", output);
            Assert.Contains("Number: 7", output);

            Assert.Contains("Total sum: 24", output);

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

ProgramTests.cs

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