public void ReattachToParentThrows()
{
var parent = new TransformationNode("parent");
var newParent = new TransformationNode("newParent");
var child = new TransformationNode("child");
child.AttachToParent(parent);
Assert.ThrowsException <InvalidOperationException>(() => child.AttachToParent(parent), "original parent");
Assert.ThrowsException <InvalidOperationException>(() => child.AttachToParent(newParent), "new parent");
}
public void AttachToParentStoresParent()
{
var parent = new TransformationNode("parent");
var child = new TransformationNode("child");
child.AttachToParent(parent);
Assert.AreSame(parent, child.Parent);
}
public TransformationNode CreateNode(TransformationNode precursor, string word)
{
// can remove this restriction if we want (since the other overload allows it, anyway)
if (precursor == null)
{
throw new ArgumentNullException(nameof(precursor));
}
var node = new TransformationNode(word);
node.AttachToParent(precursor);
return(node);
}