code: def test_cminus_nans():
      # Regression test for https://github.com/astroML/astroML/issues/234
  
      x = [10.02, 10.00]
      y = [14.97, 14.99]
      xmax = [10.03, 10.01]
      ymax = [14.98, 15.00]
  
      assert np.isfinite(np.sum(Cminus(x, y, xmax, ymax)))
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_cminus_nans() without return types