code: def test_main_cc():
      x = basicdata()
      G = knn(x, 1)
      l = G.cc()
      l = G.main_cc()
      assert np.size(l) == 6
  
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 27 for calling a global function with example usage: test_main_cc() without return types