using Xunit;
using System;
using System.IO;

namespace ConsoleApp.Tests
{
    public class ProgramTests
    {
        [Fact(DisplayName = "CalculateSavings prints correct days and total for 50 daily, 200 target")]
        public void CalculateSavings_PrintsCorrectOutput()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.CalculateSavings(50, 200);

            string output = sw.ToString();
            Assert.Contains("It took 4 days to reach the target.", output);
            Assert.Contains("Total saved: 200", output);

            // Restore standard output
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }

        [Fact(DisplayName = "CalculateSavings works when target is smaller than daily saving")]
        public void CalculateSavings_TargetLessThanDaily()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.CalculateSavings(100, 50);

            string output = sw.ToString();
            Assert.Contains("It took 1 days to reach the target.", output);
            Assert.Contains("Total saved: 100", output);

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

        [Fact(DisplayName = "CalculateSavings works for exact multiple of daily saving")]
        public void CalculateSavings_ExactMultiple()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.CalculateSavings(25, 100);

            string output = sw.ToString();
            Assert.Contains("It took 4 days to reach the target.", output);
            Assert.Contains("Total saved: 100", output);

            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!

In this section we will get an introduction to C#. Moreover, we will also learn some basic elements of the C# language.

In any programming language we have to deal with different types of data. In this section we will learn about that.

In this section we will learn about features of C# that help us control the flow of the program such as executing pieces of code based on conditions.

In this section we will learn about how to deal with repetitive tasks in programming.

Arrays are an important part of any programming language as they let us group together and manipulate a large amount of similar data. In this section we will learn about Arrays and how to use them for practical applications.

In this section we will learn about one of of the most widely used and essential features of C# called Methods. We will also explore its uses through creative practice tasks. 

Challenge: do-while Loop

解答