code: def test_save_setting_missing_resolution(self):
      b = BytesIO()
      with Image.open("Tests/images/10ct_32bit_128.tiff") as im:
          im.save(b, format="tiff", resolution=123.45)
      with Image.open(b) as im:
          assert im.tag_v2[X_RESOLUTION] == 123.45
          assert im.tag_v2[Y_RESOLUTION] == 123.45
  
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 13 for calling the TestFileTiff obj's underlying member method code with example usage: obj.test_save_setting_missing_resolution() without return types