code: def test_fullscreen():
      m = folium.Map([47, 3], zoom_start=1)
      fs = plugins.Fullscreen().add_to(m)
  
      out = normalize(m._parent.render())
  
      # verify that the fullscreen control was rendered
      tmpl = Template(
          """
          L.control.fullscreen(
              {{ this.options|tojson }}
          ).addTo({{this._parent.get_name()}});
      """
      )
  
      assert normalize(tmpl.render(this=fs)) in out
  
imports: from jinja2 import Template
  import folium
  from folium import plugins
  from folium.utilities import normalize
label_desc: Use image node_id 1 for calling a global function with example usage: test_fullscreen() without return types