Test in green: We can change the value of the node
Test in red: We can add a new single child to a node
Test in green: We can add a new single child to a node
Test in green: We can add more than one child to a node in an array
Test in red: Obtain the path to any node
Test in green: Obtain the path to any node
Test in red: Obtain the deep of a node in a level three