using Xunit;

namespace ConsoleApp.Tests
{
    public class ProgramTests
    {
        [Fact(DisplayName = "CalculateFinalPrice calculates correctly with discount")]
        public void CalculateFinalPrice_ReturnsCorrectValue()
        {
            // 50 * 4 = 200, 10% discount => 180
            double result1 = Program.CalculateFinalPrice(50.0, 4, 10);
            Assert.Equal(180.0, result1, 2);

            // 100 * 3 = 300, 0% discount => 300
            double result2 = Program.CalculateFinalPrice(100.0, 3, 0);
            Assert.Equal(300.0, result2, 2);

            // 20 * 5 = 100, 50% discount => 50
            double result3 = Program.CalculateFinalPrice(20.0, 5, 50);
            Assert.Equal(50.0, result3, 2);
        }

        [Fact(DisplayName = "CalculateFinalPrice returns 0 if quantity is 0")]
        public void CalculateFinalPrice_ReturnsZeroForZeroQuantity()
        {
            double result = Program.CalculateFinalPrice(100.0, 0, 10);
            Assert.Equal(0.0, result, 2);
        }

        [Fact(DisplayName = "CalculateFinalPrice works for 100% discount")]
        public void CalculateFinalPrice_ReturnsZeroForFullDiscount()
        {
            double result = Program.CalculateFinalPrice(50.0, 5, 100);
            Assert.Equal(0.0, result, 2);
        }
    }
}

ProgramTests.cs

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Challenge: Method with Parameters

解答