
using Xunit;
using System;
using System.IO;

namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "Main prints all required order information")] 
        public void Main_PrintsOrderInfo() {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.TestMain(new string[0]);
            string output = sw.ToString();

            Assert.Contains("Order number", output); // Success if label is present
            Assert.Contains("Quantity", output);
            Assert.Contains("Price per item", output);
            Assert.Contains("Total price", output);

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

        [Fact(DisplayName = "Main prints correct example values")] 
        public void Main_PrintsExampleValues() {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.TestMain(new string[0]);
            string output = sw.ToString();

            Assert.Contains("1001", output); // order number
            Assert.Contains("3", output);    // quantity
            Assert.Contains("5000", output); // price per item
            Assert.Contains("15000", output); // total price

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

ProgramTests.cs

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