docstr: Test that an exception is raised with an invalid strategy string
docstr_tok: ["Test","that","an","exception","is","raised","with","an","invalid","strategy","string"]
code: def test_prepare_module_strategy_invalid_str(self) -> None:
      """
      Test that an exception is raised with an invalid strategy string
      """
  
      with self.assertRaisesRegex(
          ValueError, "Strategy foo not supported"
      ):
          prepare_module(
              module=torch.nn.Linear(2, 2),
              device=init_from_env(),
              strategy="foo",
          )
  
imports: import unittest
  from unittest.mock import patch
  import torch
  from torch.distributed.fsdp import FullyShardedDataParallel
  from torch.distributed.fsdp.fully_sharded_data_parallel import MixedPrecision
  from torch.nn.parallel import DistributedDataParallel
  from torchtnt.utils.env import init_from_env
  from torchtnt.utils.prepare_module import _is_fsdp_module, DDPStrategy, FSDPStrategy, NOOPStrategy, prepare_ddp, prepare_fsdp, prepare_module, TorchCompileParams
  from torchtnt.utils.test_utils import spawn_multi_process
  from torchtnt.utils.version import is_torch_version_geq_1_13, is_torch_version_geq_2_0
label_desc: Use image node_id 13 for calling the PrepareModelTest obj's underlying member method code with example usage: obj.test_prepare_module_strategy_invalid_str() without return types