code: def testUpgradeCopyWithSymlink(self):
      if os.name == "nt":
          self.skipTest("os.symlink doesn't work uniformly on Windows.")
  
      upgrade_dir = os.path.join(self.get_temp_dir(), "foo")
      output_dir = os.path.join(self.get_temp_dir(), "bar")
      os.mkdir(upgrade_dir)
      file_a = os.path.join(upgrade_dir, "a.py")
      file_b = os.path.join(upgrade_dir, "b.py")
  
      with open(file_a, "a") as f:
          f.write("import foo as f")
      os.symlink(file_a, file_b)
  
      upgrader = ast_edits.ASTCodeUpgrader(RenameImports())
      upgrader.process_tree(
          upgrade_dir, output_dir, copy_other_files=True
      )
  
      new_file_a = os.path.join(output_dir, "a.py")
      new_file_b = os.path.join(output_dir, "b.py")
      self.assertTrue(os.path.islink(new_file_b))
      self.assertEqual(new_file_a, os.readlink(new_file_b))
      with open(new_file_a, "r") as f:
          self.assertEqual("import bar as f", f.read())
  
imports: import ast
  import io
  import os
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import test
  from tensorflow.tools.compatibility import ast_edits
label_desc: Use image node_id 23 for calling the TestAstEdits obj's underlying member method code with example usage: obj.testUpgradeCopyWithSymlink() without return types