tests.traversal.test_depthfirst.test_dft_deterministic

tests.traversal.test_depthfirst.test_dft_deterministic(graph_clrs09_22_6, func)

Make sure they do the same thing every time, given the same inputs. this was an issue during development due to the use of unordered sets

Need to be careful here that we only care that things are the same between runs, and not match any given order, as there are multiple correct answers for a DFT of any given graph.