// Spend 30 minutes writing one test...
[Fact]
public void CreateBooking_ValidData_ReturnsBooking()
{
    // Arrange... Act... Assert... 😴
}

public class BookingServiceTests
{
    private readonly Mock<IFlightRepository> _flightRepo;
    private readonly Mock<IBookingRepository> _bookingRepo;
    private readonly BookingService _sut;

    public BookingServiceTests()
    {
        _flightRepo = new Mock<IFlightRepository>();
        _bookingRepo = new Mock<IBookingRepository>();
        _sut = new BookingService(_flightRepo.Object, _bookingRepo.Object);
    }

    [Fact]
    public void CreateBooking_WithValidFlight_ReturnsNewBooking()
    {
        // Arrange
        var flight = new Flight { Id = 1, AvailableSeats = 10 };
        _flightRepo.Setup(r => r.GetById(1)).Returns(flight);
        
        // Act
        var result = _sut.CreateBooking(1, "John Doe", "john@example.com");
        
        // Assert
        Assert.NotNull(result);
        Assert.Equal("John Doe", result.PassengerName);
    }

    [Fact]
    public void CreateBooking_FlightNotFound_ThrowsException()
    {
        // Arrange
        _flightRepo.Setup(r => r.GetById(99)).Returns((Flight)null);
        
        // Act & Assert
        Assert.Throws<FlightNotFoundException>(() => 
            _sut.CreateBooking(99, "John", "john@example.com"));
    }

    [Theory]
    [InlineData("")]
    [InlineData(null)]
    [InlineData("   ")]
    public void CreateBooking_InvalidPassengerName_ThrowsValidationException(string name)
    {
        // Arrange & Act & Assert
        Assert.Throws<ValidationException>(() => 
            _sut.CreateBooking(1, name, "john@example.com"));
    }

    // ... 10 more comprehensive tests generated
}

# 1. Show existing service
cat Services/BookingService.cs

# 2. Ask agent: "Generate unit tests for BookingService"

# 3. Agent creates BookingServiceTests.cs with:
#    - 15+ test methods
#    - Mocked dependencies
#    - Edge cases covered

# 4. Run tests
dotnet test