
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "Returns true and correct values for valid date and positive guest count")] 
        public void ValidateReservationInput_ValidInput_ReturnsTrueAndCorrectValues() {
            DateTime reservationDate;
            int numberOfGuests;
            bool result = ReservationSystem.ValidateReservationInput("2024-07-01", "5", out reservationDate, out numberOfGuests);
            Assert.True(result, "Should return true for valid date and positive guest count");
            Assert.Equal(new DateTime(2024, 7, 1), reservationDate);
            Assert.Equal(5, numberOfGuests);
        }

        [Fact(DisplayName = "Returns false and sets defaults for invalid date input")] 
        public void ValidateReservationInput_InvalidDate_ReturnsFalseAndDefaults() {
            DateTime reservationDate;
            int numberOfGuests;
            bool result = ReservationSystem.ValidateReservationInput("notadate", "3", out reservationDate, out numberOfGuests);
            Assert.False(result, "Should return false for invalid date input");
            Assert.Equal(default(DateTime), reservationDate);
            Assert.Equal(0, numberOfGuests);
        }

        [Fact(DisplayName = "Returns false and sets defaults for non-integer guest count")] 
        public void ValidateReservationInput_NonIntegerGuests_ReturnsFalseAndDefaults() {
            DateTime reservationDate;
            int numberOfGuests;
            bool result = ReservationSystem.ValidateReservationInput("2024-07-01", "abc", out reservationDate, out numberOfGuests);
            Assert.False(result, "Should return false for non-integer guest input");
            Assert.Equal(default(DateTime), reservationDate);
            Assert.Equal(0, numberOfGuests);
        }

        [Fact(DisplayName = "Returns false and sets defaults for zero or negative guest count")] 
        public void ValidateReservationInput_NonPositiveGuests_ReturnsFalseAndDefaults() {
            DateTime reservationDate;
            int numberOfGuests;
            bool result = ReservationSystem.ValidateReservationInput("2024-07-01", "0", out reservationDate, out numberOfGuests);
            Assert.False(result, "Should return false for zero guest count");
            Assert.Equal(default(DateTime), reservationDate);
            Assert.Equal(0, numberOfGuests);
            
            result = ReservationSystem.ValidateReservationInput("2024-07-01", "-3", out reservationDate, out numberOfGuests);
            Assert.False(result, "Should return false for negative guest count");
            Assert.Equal(default(DateTime), reservationDate);
            Assert.Equal(0, numberOfGuests);
        }
    }
}

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: Robust Input Handling

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Challenge: Robust Input Handling

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