code: def test_pass_eliminated(self):
      t = self.run_pipeline([NormalizeTree(None)], "pass")
      self.assertTrue(len(t.stats) == 0)
  
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 6 for calling the TestNormalizeTree obj's underlying member method code with example usage: obj.test_pass_eliminated() without return types