code: def test_savez_compressed(self):
      self.check_savez(cupy.savez_compressed)
  
file_path: cupy/tests/cupy_tests/io_tests/test_npz.py
imports: import io
  import pickle
  import unittest
  import cupy
  from cupy import testing
label_desc: Use image node_id 6 for calling the TestNpz obj's underlying member method code with example usage: obj.test_savez_compressed() without return types