def setup(self):
        print "\n-------------------\nTests in: %s\n" % __name__
generates an ordered node_list such that parent appears before children
dataset/ETHPy150Open bigmlcom/python/bigml/tests/test_28_association.py/TestAssociation.setup--crossover with--dataset/ETHPy150Open balajiln/mondrianforest/src/mondrianforest.py/MondrianTree.gen_node_list