code: def test_statinexpr(self):
      t = self.run_pipeline(
          [NormalizeTree(None)],
          """
              a, b = x, y
          """,
      )
      self.assertLines(
          """
  (root): StatListNode
    stats[0]: SingleAssignmentNode
      lhs: TupleNode
        args[0]: NameNode
        args[1]: NameNode
      rhs: TupleNode
        args[0]: NameNode
        args[1]: NameNode
  """,
          self.treetypes(t),
      )
  
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 4 for calling the TestNormalizeTree obj's underlying member method code with example usage: obj.test_statinexpr() without return types