code: def test_scroll_zoom_toggler():
      m = folium.Map([45.0, 3.0], zoom_start=4)
      szt = plugins.ScrollZoomToggler()
      m.add_child(szt)
  
      out = normalize(m._parent.render())
  
      # Verify that the div has been created.
      tmpl = Template(
          """
          <img id="{{this.get_name()}}" alt="scroll"
          src="https://cdnjs.cloudflare.com/ajax/libs/ionicons/2.0.1/png/512/arrow-move.png"
          style="z-index: 999999"
          onclick="{{this._parent.get_name()}}.toggleScroll()"></img>
      """
      )
      assert "".join(tmpl.render(this=szt).split()) in "".join(
          out.split()
      )
  
      # Verify that the style has been created
      tmpl = Template(
          """
          <style>
              #{{this.get_name()}} {
                  position:absolute;
                  width:35px;
                  bottom:10px;
                  height:35px;
                  left:10px;
                  background-color:#fff;
                  text-align:center;
                  line-height:35px;
                  vertical-align: middle;
                  }
          </style>
      """
      )
      expected = normalize(tmpl.render(this=szt))
      assert expected in out
  
      # Verify that the script is okay.
      tmpl = Template(
          """
          {{this._parent.get_name()}}.scrollEnabled = true;
  
          {{this._parent.get_name()}}.toggleScroll = function() {
              if (this.scrollEnabled) {
                  this.scrollEnabled = false;
                  this.scrollWheelZoom.disable();
              } else {
                  this.scrollEnabled = true;
                  this.scrollWheelZoom.enable();
              }
          };
  
          {{this._parent.get_name()}}.toggleScroll();
      """
      )
      expected = normalize(tmpl.render(this=szt))
      assert expected in out
  
      bounds = m.get_bounds()
      assert bounds == [[None, None], [None, None]], bounds
  
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_scroll_zoom_toggler() without return types