class_docstr: Test class for prompt tokenization strategies with sys prompt from the dataset
class_docstr_tok: ["Test","class","for","prompt","tokenization","strategies","with","sys","prompt","from","the","dataset"]
code: def test_llama2_chat_integration(self):
      with open(
          Path(__file__).parent / "fixtures/conversation.json",
          encoding="utf-8",
      ) as fin:
          data = fin.read()
          conversation = json.loads(data)
      with open(
          Path(__file__).parent
          / "fixtures/conversation.tokenized_llama2chat.json",
          encoding="utf-8",
      ) as fin:
          data = fin.read()
          tokenized_conversation = json.loads(data)
      prompter = Llama2ChatPrompter()
      strat = LLama2ChatTokenizingStrategy(
          prompter,
          self.tokenizer,
          False,
          4096,
      )
      example = strat.tokenize_prompt(conversation)
      for fields in ["input_ids", "attention_mask", "labels"]:
          self.assertEqual(
              len(example[fields]), len(tokenized_conversation[fields])
          )
          self.assertEqual(
              example[fields], tokenized_conversation[fields]
          )
  
imports: import json
  import logging
  import unittest
  from copy import deepcopy
  from pathlib import Path
  from typing import Optional
  import pytest
  from transformers import AutoTokenizer, LlamaTokenizer
  from axolotl.prompt_strategies.alpaca_chat import NoSystemPrompter
  from axolotl.prompt_strategies.alpaca_w_system import InstructionWSystemPromptTokenizingStrategy, SystemDataPrompter
  from axolotl.prompt_strategies.llama2_chat import Llama2ChatPrompter, LLama2ChatTokenizingStrategy
  from axolotl.prompt_tokenizers import AlpacaPromptTokenizingStrategy, ShareGPTPromptTokenizingStrategy
  from axolotl.prompters import AlpacaPrompter, PromptStyle, ShareGPTPrompterV2
label_desc: Use image node_id 2 for calling the Llama2ChatTokenizationTest obj's underlying member method code with example usage: obj.test_llama2_chat_integration() without return types