code: def json(self):
      return self.data
  
imports: import functools
  import re
  import tempfile
  from contextlib import contextmanager
  from pathlib import Path
  from unittest import mock
  import pytest
  from dev.set_matrix import generate_matrix
label_desc: Use image node_id 2 for calling the MockResponse obj's underlying member method code with example usage: obj.json() and returns: self