code: def test_repr_png_error(self):
      im = hopper("F")
  
      with pytest.raises(ValueError):
          im._repr_png_()
  
imports: import re
  import sys
  import zlib
  from io import BytesIO
  import pytest
  from PIL import Image, ImageFile, PngImagePlugin, features
  from .helper import PillowLeakTestCase, assert_image, assert_image_equal, assert_image_equal_tofile, hopper, is_win32, mark_if_feature_version, skip_unless_feature
label_desc: Use image node_id 35 for calling the TestFilePng obj's underlying member method code with example usage: obj.test_repr_png_error() without return types