code: def test_example_namespace_id():
      vw_ex = Workspace(quiet=True)
      ex = vw_ex.example("1 |a two features |b more features here")
      ns = vowpalwabbit.NamespaceId(ex, 1)
      assert isinstance(ex.get_ns(1), vowpalwabbit.NamespaceId)
      assert isinstance(ex[2], vowpalwabbit.ExampleNamespace)
      assert ex.setup_done is True
      assert ex.num_features_in(ns) == 3
  
imports: import os
  from pathlib import Path
  import vowpalwabbit
  from vowpalwabbit import Workspace
  import pytest
  import warnings
  import filecmp
label_desc: Use image node_id 34 for calling a global function with example usage: test_example_namespace_id() without return types