public bool Validate(Car car)
{
var isValid = true;
if (car.NumberOfDoors <= 0) isValid = false;
if (car.BrandName == null) return false;
if (string.IsNullOrWhiteSpace(car.ModelName)) isValid = false;
if (car.NeedsEngine)
{
if (car.Engine == null) isValid = false;
else
{
// validate engine
if (!ValidateEngine(car.Engine)) isValid = false;
}
}
else
{
if (car.Engine != null) isValid = false; // if NeedsEngine is false, Engine must be null
}
if (!car.Wheels.Any())
{
isValid = false; // must have some wheels
}
if (car.Wheels.Count > 4)
{
isValid = false; // must have no more than 4 wheels
}
return isValid;
}
private Car MakeValidCar()
{
var c = new Car();
c.BrandName = "Renault";
c.ModelName = "Megane";
c.NumberOfDoors = 3;
// add 4 wheels
Enumerable.Range(0, 4).ToList()
.ForEach(i => c.Wheels.Add(new Wheel(c, i)));
c.Engine = new DieselEngine();
return c;
}