
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "Throws OutOfStockException when requested quantity exceeds stock")]
        public void PlaceOrder_ThrowsOutOfStockException_WhenQuantityExceedsStock()
        {
            var order = new ProductOrder(3);
            var ex = Assert.Throws<OutOfStockException>(() => order.PlaceOrder(4));
            Assert.Equal("Requested quantity exceeds available stock.", ex.Message);
        }

        [Fact(DisplayName = "Reduces stock correctly when requested quantity is within stock")]
        public void PlaceOrder_ReducesStock_WhenQuantityWithinStock()
        {
            var order = new ProductOrder(8);
            order.PlaceOrder(5);
            Assert.Equal(3, order.Stock);
        }

        [Fact(DisplayName = "Does not throw when requested quantity equals stock")]
        public void PlaceOrder_DoesNotThrow_WhenQuantityEqualsStock()
        {
            var order = new ProductOrder(6);
            order.PlaceOrder(6);
            Assert.Equal(0, order.Stock);
        }
    }
}

ProgramTests.cs

Master the art of robust C# programming by learning how to handle, create, and debug exceptions. This hands-on course guides you through real-world error handling scenarios, from basic try-catch to custom exceptions and safe file operations.

Learn the basics of exceptions in C#, how to use try-catch blocks, and why error handling is crucial for robust applications.

Learn to create your own exception types and use guard clauses to prevent invalid states in your code.

Master techniques for validating user input and safely parsing data to prevent runtime errors.

Handle file operations safely and learn to debug exceptions using stack traces and refactoring techniques.

Challenge: Guard Clauses with Custom Exceptions

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