code: def test_kruskal():
      """test Kruskal's algor to thin the graph"""
      x = basicdata()
      dmax = np.sqrt((x**2).sum())
      m = mst(x)
      g = eps_nn(x, dmax)
      k = g.kruskal()
      assert_almost_equal(k.weights.sum(), m.weights.sum())
  
imports: import numpy
  import numpy.random
  from numpy.testing import assert_almost_equal, assert_array_almost_equal, assert_array_equal
  from ..graph import WeightedGraph, complete_graph, concatenate_graphs, eps_nn, knn, mst, wgraph_from_3d_grid, wgraph_from_adjacency, wgraph_from_coo_matrix
label_desc: Use image node_id 47 for calling a global function with example usage: test_kruskal() without return types