code: def test__repr_png_is_bytes(m_png):
      png = m_png._repr_png_()
      assert isinstance(png, bytes)
  
file_path: folium/tests/test_repr.py
imports: import io
  import PIL.Image
  import pytest
  import folium
label_desc: Use image node_id 6 for calling a global function with example usage: test__repr_png_is_bytes(m_png) without return types