code: def test_item(self, xp, dtype):
      if runtime.is_hip and (
          self.shape == (1,)
          or (self.shape == (2, 3) and not hasattr(self, "order"))
      ):
          pytest.xfail("ROCm/HIP may have a bug")
      a = testing.shaped_arange(self.shape, xp, dtype)
      if hasattr(self, "order"):
          return a.tobytes(self.order)
      else:
          return a.tobytes()
  
file_path: cupy/tests/cupy_tests/core_tests/test_ndarray_conversion.py
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy.cuda import runtime
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestNdarrayToBytes obj's underlying member method code with example usage: obj.test_item(xp, dtype) and returns: a, a