using Xunit;

namespace ConsoleApp
{
    public class ProgramTests
    {
        [Fact(DisplayName = "CalculateTotalCost returns correct total for normal values")]
        public void CalculateTotalCost_ReturnsCorrectTotal()
        {
            int result = Program.CalculateTotalCost(100, 3);
            Assert.Equal(300, result);

            result = Program.CalculateTotalCost(50, 5);
            Assert.Equal(250, result);
        }

        [Fact(DisplayName = "CalculateTotalCost returns 0 if quantity is 0")]
        public void CalculateTotalCost_QuantityZero_ReturnsZero()
        {
            int result = Program.CalculateTotalCost(100, 0);
            Assert.Equal(0, result);
        }

        [Fact(DisplayName = "CalculateTotalCost works with itemPrice 0")]
        public void CalculateTotalCost_ItemPriceZero_ReturnsZero()
        {
            int result = Program.CalculateTotalCost(0, 5);
            Assert.Equal(0, result);
        }

        [Theory(DisplayName = "CalculateTotalCost works with multiple combinations")]
        [InlineData(10, 1, 10)]
        [InlineData(20, 4, 80)]
        [InlineData(15, 0, 0)]
        [InlineData(0, 10, 0)]
        public void CalculateTotalCost_MultipleCases(int price, int quantity, int expected)
        {
            int result = Program.CalculateTotalCost(price, quantity);
            Assert.Equal(expected, result);
        }
    }
}

ProgramTests.cs

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Challenge: for Loop

Solution