Test in red: The node should have a name
Test in green: The node should have a name
Test in red: The node has a 0 deep when it hasn't parents
Test in red: The deep of a child shold be one when it only has one node over it
Test in green: The deep of a child shold be one when it only has one node over it
Test in red: The cost of the child node should be 4
Test in red: We can put cost a node
Test in green: We can put cost a node
Some changes in the code
Test in red: We can change the value of the node