class_docstr: Test AlpacaPrompter
class_docstr_tok: ["Test","AlpacaPrompter"]
code: def test_prompt_style_w_none(self):
      prompter = AlpacaPrompter(prompt_style=None)
      res = next(prompter.build_prompt("tell me a joke"))
      # just testing that it uses instruct style
      assert "### Instruction:" in res
  
file_path: axolotl/tests/test_prompters.py
imports: import unittest
  from axolotl.prompt_strategies.alpaca_w_system import SystemDataPrompter
  from axolotl.prompters import AlpacaPrompter, MultipleChoiceExplainPrompter, PromptStyle, UnpromptedPrompter
label_desc: Use image node_id 1 for calling the AlpacaPrompterTest obj's underlying member method code with example usage: obj.test_prompt_style_w_none() without return types