In these tasks, the `Main` method is already implemented. You need to write your solution in the additional method where the placeholders are provided.

Note

using Xunit;
using System;
using System.IO;

namespace ConsoleApp.Tests
{
    public class ProgramTests
    {
        [Fact(DisplayName = "RunStoreCalculator prints correct calculations")]
        public void RunStoreCalculator_PrintsCorrectValues()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.RunStoreCalculator(price: 50.0, quantity: 4, discountPercent: 10.0, taxPercent: 8.0);

            string output = sw.ToString();

            Assert.Contains("Total price: 200", output);       // 50 * 4
            Assert.Contains("Discount amount: 20", output);    // 200 * 10 / 100
            Assert.Contains("Tax amount: 14.4", output);       // (200 - 20) * 8 / 100
            Assert.Contains("Final price: 194.4", output);     // 200 - 20 + 14.4

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

        [Fact(DisplayName = "RunStoreCalculator works with zero discount")]
        public void RunStoreCalculator_NoDiscount()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.RunStoreCalculator(price: 100, quantity: 2, discountPercent: 0, taxPercent: 5);

            string output = sw.ToString();

            Assert.Contains("Total price: 200", output);
            Assert.Contains("Discount amount: 0", output);
            Assert.Contains("Tax amount: 10", output);        // 200 * 5 / 100
            Assert.Contains("Final price: 210", output);       // 200 - 0 + 10

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

ProgramTests.cs

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Challenge: Operators

解答