code: def test_truncate_not_enough_trials(self, space, monkeypatch):
      lineages = build_lineages_for_exploit(space, monkeypatch, num=4)
  
      exploit = self.constructor(min_forking_population=5)
  
      assert exploit(RNGStub(), TrialStub(), lineages) is None
  
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 2 for calling the TruncateGenericTests obj's underlying member method code with example usage: obj.test_truncate_not_enough_trials(space, monkeypatch) without return types