code: def test_fast_marker_cluster_data(case):
      data = FastMarkerCluster(case).data
      assert isinstance(data, list)
      assert len(data) == 3
      for i in range(len(data)):
          assert isinstance(data[i], list)
          assert len(data[i]) == 3
          assert data[i][0] == float(i)
          assert data[i][1] == float(i + 5)
  
file_path: folium/tests/plugins/test_fast_marker_cluster.py
imports: import numpy
  import pandas
  import pytest
  from jinja2 import Template
  import folium
  from folium.plugins import FastMarkerCluster
  from folium.utilities import normalize
label_desc: Use image node_id 2 for calling a global function with example usage: test_fast_marker_cluster_data(case) without return types