public void CanRetrieveIdOfChild ()
{
// given
var obj = new KspObject ("OBJ")
.AddChild (new KspCraftObject ())
.AddChild (new KspPartObject ())
.AddChild (new KspPartObject ())
.AddChild (new KspPartObject ())
.AddChild (new KspCraftObject ());
// when / then
Assert.That (obj.IdOfChild (obj.Children [0] as KspCraftObject), Is.EqualTo (0)); // Ids are per object-type
Assert.That (obj.IdOfChild (obj.Children [4] as KspCraftObject), Is.EqualTo (1));
Assert.That (obj.IdOfChild (obj.Children [1] as KspPartObject), Is.EqualTo (0));
Assert.That (obj.IdOfChild (obj.Children [2] as KspPartObject), Is.EqualTo (1));
Assert.That (obj.IdOfChild (obj.Children [3] as KspPartObject), Is.EqualTo (2));
}
