
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

Get ready to embark on a thrilling coding journey with C# - the language that powers Windows applications, games, and more. Unlock the potential to build everything from dynamic web apps to powerful desktop software. With its elegance, performance, and versatility, C# is your gateway to the future of programming. Let's dive in and bring your coding dreams to life!

Challenge: Order Information

Example output:

Solution