code: def filtered_idxs(self):
      self._check_results()
      return np.where(self.results.passed == None)[0]
  
imports: from abc import ABC, abstractmethod
  import dill
  from munch import Munch
  import numpy
  import inspect
  from .expect import iter_with_optional, Expect
  from .viewer.test_summarizer import TestSummarizer
label_desc: Use image node_id 20 for calling the AbstractTest obj's underlying member method code with example usage: obj.filtered_idxs() and returns: np