code: def test_init_error(self):
      with self.assertRaises(ValueError):
          NamespaceReader(["path1", "path2"])
  
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 3 for calling the NamespaceReaderTest obj's underlying member method code with example usage: obj.test_init_error() without return types