code: def test_valid_png_size(m_png):
      from folium.utilities import _parse_size
  
      w = h = 500
      m_png.width = _parse_size(w)
      m_png.height = _parse_size(h)
      png = m_png._repr_png_()
      img = PIL.Image.open(io.BytesIO(png))
      assert img.size == (w, h)
  
file_path: folium/tests/test_repr.py
imports: import io
  import PIL.Image
  import pytest
  import folium
label_desc: Use image node_id 8 for calling a global function with example usage: test_valid_png_size(m_png) without return types