code: def get_trials(self, lineages, trial):
      return lineages.get_elites(max_depth=trial) + [trial]
  
imports: import numpy
  import pytest
  from base import RNGStub, TrialStub
  from orion.algo.pbt.exploit import BacktrackExploit, PipelineExploit, TruncateExploit
  from orion.algo.pbt.pbt import Lineages
label_desc: Use image node_id 1 for calling the TestTruncateWithBacktracking obj's underlying member method code with example usage: obj.get_trials(lineages, trial) and returns: unknown