def METHOD_NAME(self):
    self._file = os.path.abspath('../../../test/tests/reporters/perf_graph_reporter/gold/perf_graph_reporter_json.json')
    reader = ReporterReader(self._file)
    reader.update(reader.times()[-1])
    self._data = reader[('perf_graph', 'graph')]
    self._root_node = self._data['MooseTestApp (main)']