code: def testPickle(self):
      pickle = [
          128,
          2,
          99,
          105,
          103,
          114,
          97,
          112,
          104,
          10,
          71,
          114,
          97,
          112,
          104,
          10,
          113,
          1,
          40,
          75,
          3,
          93,
          113,
          2,
          75,
          1,
          75,
          2,
          134,
          113,
          3,
          97,
          137,
          125,
          125,
          125,
          116,
          82,
          113,
          4,
          125,
          98,
          46,
      ]
      pickle = bytes(pickle)
      with temporary_file(pickle, "wb", binary=True) as tmpfname:
          g = Graph.Read_Pickle(pickle)
          self.assertTrue(isinstance(g, Graph))
          self.assertTrue(
              g.vcount() == 3
              and g.ecount() == 1
              and not g.is_directed()
          )
          g.write_pickle(tmpfname)
  
imports: import gzip
  import io
  import unittest
  import warnings
  from igraph import Graph, InternalError
  from .utils import temporary_file
label_desc: Use image node_id 11 for calling the ForeignTests obj's underlying member method code with example usage: obj.testPickle() without return types