code: def test_open_file(self):
      path = MultiplexedPath(self.folder)
      with self.assertRaises(FileNotFoundError):
          path.read_bytes()
      with self.assertRaises(FileNotFoundError):
          path.read_text()
      with self.assertRaises(FileNotFoundError):
          path.open()
  
imports: import os.path
  import sys
  import pathlib
  import unittest
  from importlib import import_module
  from importlib.readers import MultiplexedPath, NamespaceReader
label_desc: Use image node_id 8 for calling the MultiplexedPathTest obj's underlying member method code with example usage: obj.test_open_file() without return types