public void Detach_not_set_node_must_not_throw_an_expetion()
{
var root = new BinaryTreeSpec(1);
root.DetachLeftNode();
root.DetachRightNode();
Assert.IsFalse(root.HasLeft);
}
public void Detach_left_node_must_clear_relationship_in_both_ways()
{
var root = new BinaryTreeSpec(1);
var left = new BinaryTreeSpec(2);
root.SetLeft(left);
root.DetachLeftNode();
Assert.IsFalse(root.HasLeft);
Assert.IsTrue(left.IsRoot);
}