class_docstr: Test Trial object and class.
code: def test_no_exp_working_dir(self):
      trial = Trial()
  
      with pytest.raises(
          RuntimeError, match="Cannot infer trial's working_dir"
      ):
          trial.working_dir
  
imports: import copy
  import datetime
  import os
  import warnings
  import bson
  import numpy
  import pytest
  from orion.core.worker.trial import Trial
label_desc: Use image node_id 30 for calling the TestTrial obj's underlying member method code with example usage: obj.test_no_exp_working_dir() without return types