code: def test_marker_cluster():
      N = 100
      np.random.seed(seed=26082009)
      data = np.array(
          [
              np.random.uniform(
                  low=35, high=60, size=N
              ),  # Random latitudes.
              np.random.uniform(
                  low=-12, high=30, size=N
              ),  # Random longitudes.
          ]
      ).T
      m = folium.Map([45.0, 3.0], zoom_start=4)
      mc = plugins.MarkerCluster(data).add_to(m)
  
      tmpl_for_expected = Template(
          """
          var {{this.get_name()}} = L.markerClusterGroup(
              {{ this.options|tojson }}
          );
          {%- if this.icon_create_function is not none %}
              {{ this.get_name() }}.options.iconCreateFunction =
                  {{ this.icon_create_function.strip() }};
              {%- endif %}
  
          {% for marker in this._children.values() %}
              var {{marker.get_name()}} = L.marker(
                  {{ marker.location|tojson }},
                  {}
              ).addTo({{this.get_name()}});
          {% endfor %}
  
          {{ this.get_name() }}.addTo({{ this._parent.get_name() }});
      """
      )
      expected = normalize(tmpl_for_expected.render(this=mc))
  
      out = normalize(m._parent.render())
  
      # We verify that imports
      assert (
          '<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet.markercluster/1.1.0/leaflet.markercluster.js"></script>'  # noqa
          in out
      )  # noqa
      assert (
          '<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet.markercluster/1.1.0/MarkerCluster.css"/>'  # noqa
          in out
      )  # noqa
      assert (
          '<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet.markercluster/1.1.0/MarkerCluster.Default.css"/>'  # noqa
          in out
      )  # noqa
  
      assert expected in out
  
      bounds = m.get_bounds()
      np.testing.assert_allclose(
          bounds,
          [
              [35.147332572663785, -11.520684337300109],
              [59.839718052359274, 29.94931046497927],
          ],
      )
  
imports: import numpy
  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_marker_cluster() without return types