code: def setup_fault_injection(self, faulty_messages, messages_to_delay):
      if faulty_messages is not None:
          self.messages_to_fail = faulty_messages
      if messages_to_delay is not None:
          self.messages_to_delay = messages_to_delay
  
file_path: pytorch/torch/testing/_internal/distributed/rpc/faulty_rpc_agent_test_fixture.py
imports: import torch.distributed.rpc
  import torch.distributed.rpc._testing
  from torch.testing._internal.distributed.rpc.rpc_agent_test_fixture import RpcAgentTestFixture
label_desc: Use image node_id 4 for calling the FaultyRpcAgentTestFixture obj's underlying member method code with example usage: obj.setup_fault_injection(faulty_messages, messages_to_delay) without return types