code: def test_calculate_pickle_checksums(self):
      checksums = _calculate_pickle_checksums(
          ["member1", "member2", "member3"]
      )
      assert 2 <= len(checksums) <= 3, checksums
  
imports: import os.path
  import unittest
  from Cython.TestUtils import TransformTest
  from Cython.Compiler.ParseTreeTransforms import *
  from Cython.Compiler.ParseTreeTransforms import _calculate_pickle_checksums
  from Cython.Compiler.Nodes import *
  from Cython.Compiler import Main, Symtab
label_desc: Use image node_id 1 for calling the TestAnalyseDeclarationsTransform obj's underlying member method code with example usage: obj.test_calculate_pickle_checksums() without return types