code: def test_packbits(self):
      self.check_packbits([0])
      self.check_packbits([1])
      self.check_packbits([0, 1])
      self.check_packbits([1, 0, 1, 1, 0, 1, 1, 1])
      self.check_packbits([1, 0, 1, 1, 0, 1, 1, 1, 1])
      self.check_packbits(numpy.arange(24).reshape((2, 3, 4)) % 2)
  
file_path: cupy/tests/cupy_tests/binary_tests/test_packing.py
imports: import numpy
  import unittest
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 3 for calling the TestPacking obj's underlying member method code with example usage: obj.test_packbits() without return types