code: def test_gpt2(self):
      prompt: str = "I am a computer scientist."
      result: RequestResult = self.client.make_request(
          Request(
              model="huggingface/gpt2",
              prompt=prompt,
              num_completions=3,
              top_k_per_token=5,
              max_tokens=0,
              echo_prompt=True,
          )
      )
      assert len(result.completions) == 3
      assert result.completions[0].text.startswith(
          prompt
      ), "echo_prompt was set to true. Expected the prompt at the beginning of each completion"
  
file_path: H2O/h2o_hf/helm/src/helm/proxy/clients/test_huggingface_client.py
imports: import os
  import pytest
  import tempfile
  from helm.common.cache import SqliteCacheConfig
  from helm.common.request import Request, RequestResult
  from helm.common.tokenization_request import DecodeRequest, DecodeRequestResult, TokenizationRequest, TokenizationRequestResult
  from .huggingface_client import HuggingFaceClient
label_desc: Use image node_id 6 for calling the TestHuggingFaceClient obj's underlying member method code with example usage: obj.test_gpt2() without return types