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

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: for Loop

Solution