
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "ParseProductInput returns correct total message for valid inputs")]
        public void ParseProductInput_ValidInputs_ReturnsTotalMessage()
        {
            string result = Program.ParseProductInput("15.50", "3");
            Assert.Contains("Total cost for 3 items at", result);
            Assert.Contains("each is", result);
        }

        [Fact(DisplayName = "ParseProductInput returns 'Invalid price input.' for invalid price")]
        public void ParseProductInput_InvalidPrice_ReturnsInvalidPriceMessage()
        {
            string result = Program.ParseProductInput("abc", "2");
            Assert.Equal("Invalid price input.", result);
        }

        [Fact(DisplayName = "ParseProductInput returns 'Invalid quantity input.' for invalid quantity")]
        public void ParseProductInput_InvalidQuantity_ReturnsInvalidQuantityMessage()
        {
            string result = Program.ParseProductInput("10.00", "xyz");
            Assert.Equal("Invalid quantity input.", result);
        }

        [Fact(DisplayName = "ParseProductInput returns 'Invalid price and quantity input.' for both invalid")]
        public void ParseProductInput_BothInvalid_ReturnsInvalidBothMessage()
        {
            string result = Program.ParseProductInput("nope", "nope");
            Assert.Equal("Invalid price and quantity input.", result);
        }
    }
}

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: Safe Parsing for User Input

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