code: def test_constructor(self):
      assert isinstance(self.model, Workspace)
  
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 1 for calling the TestVW obj's underlying member method code with example usage: obj.test_constructor() without return types