code: def test_save_float_dpi(self, tmp_path):
      outfile = str(tmp_path / "temp.tif")
      with Image.open("Tests/images/hopper.tif") as im:
          dpi = (72.2, 72.2)
          im.save(outfile, dpi=dpi)
  
          with Image.open(outfile) as reloaded:
              assert reloaded.info["dpi"] == dpi
  
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 12 for calling the TestFileTiff obj's underlying member method code with example usage: obj.test_save_float_dpi(tmp_path) without return types