code: def test_unpackbits(self):
      self.check_unpackbits([])
      self.check_unpackbits([0])
      self.check_unpackbits([1])
      self.check_unpackbits([255])
      self.check_unpackbits([100, 200, 123, 213])
  
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 8 for calling the TestPacking obj's underlying member method code with example usage: obj.test_unpackbits() without return types