I get the following Output for the Sample:
should support finding peaks expected: SolutionTest$1<{pos=[3, 7], peaks=[6, 3]}> but was: java.util.HashMap<{pos=[3, 7], peaks=[6, 3]}>
So the code works but the Output is wrong?

Tried to solve this in Java and none of the usual methods of the Node class work. There is no wa to solve this without knowing how a Node is implemented