code: def _test_op_given_array(self, func_name, create_array):
      # create_array to avoid using cast
      gs_fnc = get_backend_fnc(func_name)
  
      for dtype_str in self.dtypes_str:
          dtype = gs.set_default_dtype(dtype_str)
          args = create_array()
          if gs.is_array(args):
              args = [args]
  
          out = gs_fnc(*args)
          self.assertDtype(out.dtype, dtype)
  
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 14 for calling the DtypeTestCase obj's underlying member method code with example usage: obj._test_op_given_array(func_name, create_array) without return types