old_contents: import pytest
  import torch
  import syft as sy
  
  
  def test_sandbox():
      sy.create_sandbox(globals(), download_data=False)
  
      # check to make sure global variable gets set for alice
      assert alice == alice  # noqa: F821
      assert isinstance(alice, sy.VirtualWorker)  # noqa: F821
  
new_contents: import pytest
  import torch
  import syft as sy
  
  # Import Hook
  from syft.frameworks.torch import TorchHook
  
  # Import grids
  from syft.grid import VirtualGrid
  
  
  def test_sandbox():
      sy.create_sandbox(globals(), download_data=False)
  
      assert alice == alice  # noqa: F821
      assert isinstance(alice, sy.VirtualWorker)  # noqa: F821
      assert andy == andy # noqa: F821
      assert isinstance(andy, sy.VirtualWorker)  # noqa: F821
      assert bob == bob # noqa: F821
      assert isinstance(bob, sy.VirtualWorker)  # noqa: F821
      assert jason == jason # noqa: F821
      assert isinstance(jason, sy.VirtualWorker)  # noqa: F821
      assert jon == jon
      assert isinstance(jon, sy.VirtualWorker)  # noqa: F821
      assert theo == theo  # noqa: F821
      assert isinstance(theo, sy.VirtualWorker)  # noqa: F821
      
      assert hook == hook  # noqa: F821
      assert isinstance(hook, TorchHook)  # noqa: F821
  
      assert grid == grid  # noqa: F821
      assert isinstance(grid, VirtualGrid)  # noqa: F821
  
      assert workers == [bob, theo, jason, alice, andy, jon]  # noqa: F821
  
subject: Improve sandbox tests.