code: def probabilistic_case(self):
      MockUnitTest.probabilistic_case_counter += 1
      if MockUnitTest.probabilistic_case_counter % 2 == 0:
          MockUnitTest.probabilistic_case_success_counter += 1
          self.assertTrue(True)
      else:
          MockUnitTest.probabilistic_case_failure_counter += 1
          self.fail()
  
imports: import unittest
  import pytest
  from chainer import testing
  from chainer.testing import condition
label_desc: Use image node_id 7 for calling the MockUnitTest obj's underlying member method code with example usage: obj.probabilistic_case() without return types