def setUp(self):
        self.group = self.create_group()
Called when nodes have changed.
dataset/ETHPy150Open ofa/connect/open_connect/groups/tests/test_views.py/GroupUpdateViewTest.setUp--crossover with--dataset/ETHPy150Open enthought/pyface/pyface/tree/node_tree_model.py/NodeTreeModel._on_nodes_changed