code: def test_getattr(self):
      ar = self.client[:].apply_async(wait, 0.5)
      assert ar.completed == [None] * len(ar)
      with pytest.raises(AttributeError):
          ar._foo
      with pytest.raises(AttributeError):
          ar.__length_hint__()
      with pytest.raises(AttributeError):
          ar.foo
      assert not hasattr(ar, "__length_hint__")
      assert not hasattr(ar, "foo")
      assert hasattr(ar, "engine_id")
      ar.get(5)
      with pytest.raises(AttributeError):
          ar._foo
      with pytest.raises(AttributeError):
          ar.__length_hint__()
      with pytest.raises(AttributeError):
          ar.foo
      assert isinstance(ar.engine_id, list)
      assert ar.engine_id == ar["engine_id"]
      assert not hasattr(ar, "__length_hint__")
      assert not hasattr(ar, "foo")
      assert hasattr(ar, "engine_id")
  
imports: import os
  import time
  from datetime import datetime
  import pytest
  from IPython.utils.io import capture_output
  import ipyparallel
  from ipyparallel import error
  from .clienttest import ClusterTestCase, raises_remote
label_desc: Use image node_id 11 for calling the TestAsyncResult obj's underlying member method code with example usage: obj.test_getattr() without return types