code: def test_func_out_bool(self, func_name, args, expected):
      gs_fnc = get_backend_fnc(func_name)
  
      out = gs_fnc(*args)
      if expected:
          self.assertTrue(out)
      else:
          self.assertFalse(out)
  
imports: import random
  import numpy
  import pytest
  import scipy
  import geomstats.backend
  from geomstats.test.test_case import TestCase
  from geomstats.test.vectorization import generate_vectorization_data
label_desc: Use image node_id 9 for calling the BackendTestCase obj's underlying member method code with example usage: obj.test_func_out_bool(func_name, args, expected) without return types