public void CanCountNodesDepth()
{
// Arrange
Tree <string> tree = new Tree <string>();
Node <string> root = new Node <string>("a");
Node <string> b = new Node <string>("b");
Node <string> c = new Node <string>("c");
Node <string> d = new Node <string>("d");
Node <string> e = new Node <string>("e");
Node <string> f = new Node <string>("f");
Node <string> g = new Node <string>("g");
Node <string> h = new Node <string>("h");
Node <string> i = new Node <string>("i");
tree.Root = root;
root.LeftChild = b;
root.RightChild = c;
b.LeftChild = d;
b.RightChild = e;
c.LeftChild = f;
c.RightChild = g;
d.LeftChild = h;
d.RightChild = i;
// Act
int result = BreadthFirst.NodeDepths(root);
// Assert
Assert.Equal(16, result);
}