using Xunit;

namespace ConsoleApp.Tests
{
    public class ProgramTests
    {
        [Fact(DisplayName = "CalculateTotalSales returns correct sum for positive numbers")]
        public void CalculateTotalSales_ReturnsCorrectSum()
        {
            double[] sales = { 120.50, 99.99, 150.00, 200.00, 175.25 };
            double expected = 745.74;

            double result = Program.CalculateTotalSales(sales);

            Assert.Equal(expected, result, 2);
        }

        [Fact(DisplayName = "CalculateTotalSales returns 0 for empty array")]
        public void CalculateTotalSales_EmptyArray()
        {
            double[] sales = { };
            double expected = 0;

            double result = Program.CalculateTotalSales(sales);

            Assert.Equal(expected, result, 2);
        }

        [Fact(DisplayName = "CalculateTotalSales works with negative values")]
        public void CalculateTotalSales_NegativeValues()
        {
            double[] sales = { 100, -20, 50, -10 };
            double expected = 120;

            double result = Program.CalculateTotalSales(sales);

            Assert.Equal(expected, result, 2);
        }
    }
}

ProgramTests.cs

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Utfordring: Array-Løkker

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