code: def add_subtest(self, subtest):
      self.subtests.append(subtest)
  
imports: import collections
  import functools
  import math
  import os
  import re
  import sys
  import yatest_lib.tools
label_desc: Use image node_id 5 for calling the Test obj's underlying member method code with example usage: obj.add_subtest(subtest) without return types