class_docstr: Test class for UnpromptedPrompter with no system prompts
class_docstr_tok: ["Test","class","for","UnpromptedPrompter","with","no","system","prompts"]
code: def test_prompt_style_w_instruct(self):
      prompter = UnpromptedPrompter(
          prompt_style=PromptStyle.INSTRUCT.value
      )
      res = next(
          prompter.build_prompt(
              "tell me a joke about the following", "alpacas"
          )
      )
      assert "### Instruction:" in res
      assert "tell me a joke" in res
      assert res.startswith("###")
  
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 2 for calling the UnpromptedPrompterTest obj's underlying member method code with example usage: obj.test_prompt_style_w_instruct() without return types