code: def test_load_string(self):
      ifd = TiffImagePlugin.ImageFileDirectory_v2()
      data = b"abc\0"
      ret = ifd.load_string(data, False)
      assert ret == "abc"
  
imports: import os
  from io import BytesIO
  import pytest
  from PIL import Image, ImageFile, TiffImagePlugin
  from PIL.TiffImagePlugin import RESOLUTION_UNIT, X_RESOLUTION, Y_RESOLUTION
  from .helper import assert_image_equal, assert_image_equal_tofile, assert_image_similar, assert_image_similar_tofile, hopper, is_pypy, is_win32
label_desc: Use image node_id 33 for calling the TestFileTiff obj's underlying member method code with example usage: obj.test_load_string() without return types